diff --git a/src/applications/base/PhabricatorApplication.php b/src/applications/base/PhabricatorApplication.php
--- a/src/applications/base/PhabricatorApplication.php
+++ b/src/applications/base/PhabricatorApplication.php
@@ -61,6 +61,21 @@
     return pht('%s Application', $this->getName());
   }
 
+  /**
+   * Extensions are allowed to register multi-character monograms.
+   * The name "Monogram" is actually a bit of a misnomer,
+   * but we're keeping it due to the history.
+   *
+   * @return array
+   */
+  public function getMonograms() {
+    return array();
+  }
+
+  public function isDeprecated() {
+    return false;
+  }
+
   final public function isInstalled() {
     if (!$this->canUninstall()) {
       return true;
diff --git a/src/applications/calendar/application/PhabricatorCalendarApplication.php b/src/applications/calendar/application/PhabricatorCalendarApplication.php
--- a/src/applications/calendar/application/PhabricatorCalendarApplication.php
+++ b/src/applications/calendar/application/PhabricatorCalendarApplication.php
@@ -28,6 +28,10 @@
     return "\xE2\x8C\xA8";
   }
 
+  public function getMonograms() {
+    return array('E');
+  }
+
   public function getApplicationGroup() {
     return self::GROUP_UTILITIES;
   }
diff --git a/src/applications/chatlog/application/PhabricatorChatLogApplication.php b/src/applications/chatlog/application/PhabricatorChatLogApplication.php
--- a/src/applications/chatlog/application/PhabricatorChatLogApplication.php
+++ b/src/applications/chatlog/application/PhabricatorChatLogApplication.php
@@ -11,7 +11,7 @@
   }
 
   public function getShortDescription() {
-    return pht('(Deprecated)');
+    return pht('IRC Logs');
   }
 
   public function getIcon() {
@@ -22,6 +22,10 @@
     return true;
   }
 
+  public function isDeprecated() {
+    return true;
+  }
+
   public function getTitleGlyph() {
     return "\xE0\xBC\x84";
   }
@@ -30,7 +34,7 @@
     return self::GROUP_UTILITIES;
   }
 
- public function getRoutes() {
+  public function getRoutes() {
     return array(
       '/chatlog/' => array(
        '' => 'PhabricatorChatLogChannelListController',
diff --git a/src/applications/conpherence/application/PhabricatorConpherenceApplication.php b/src/applications/conpherence/application/PhabricatorConpherenceApplication.php
--- a/src/applications/conpherence/application/PhabricatorConpherenceApplication.php
+++ b/src/applications/conpherence/application/PhabricatorConpherenceApplication.php
@@ -28,6 +28,10 @@
     );
   }
 
+  public function getMonograms() {
+    return array('Z');
+  }
+
   public function getRoutes() {
     return array(
       '/Z(?P<id>[1-9]\d*)'
diff --git a/src/applications/countdown/application/PhabricatorCountdownApplication.php b/src/applications/countdown/application/PhabricatorCountdownApplication.php
--- a/src/applications/countdown/application/PhabricatorCountdownApplication.php
+++ b/src/applications/countdown/application/PhabricatorCountdownApplication.php
@@ -36,6 +36,10 @@
     );
   }
 
+  public function getMonograms() {
+    return array('C');
+  }
+
   public function getRoutes() {
     return array(
       '/C(?P<id>[1-9]\d*)' => 'PhabricatorCountdownViewController',
diff --git a/src/applications/dashboard/application/PhabricatorDashboardApplication.php b/src/applications/dashboard/application/PhabricatorDashboardApplication.php
--- a/src/applications/dashboard/application/PhabricatorDashboardApplication.php
+++ b/src/applications/dashboard/application/PhabricatorDashboardApplication.php
@@ -30,6 +30,10 @@
     return 0.160;
   }
 
+  public function getMonograms() {
+    return array('W');
+  }
+
   public function getRoutes() {
     $menu_rules = $this->getProfileMenuRouting(
       'PhabricatorDashboardPortalViewController');
diff --git a/src/applications/differential/application/PhabricatorDifferentialApplication.php b/src/applications/differential/application/PhabricatorDifferentialApplication.php
--- a/src/applications/differential/application/PhabricatorDifferentialApplication.php
+++ b/src/applications/differential/application/PhabricatorDifferentialApplication.php
@@ -42,6 +42,10 @@
       'engineers to review, discuss and approve changes to software.');
   }
 
+  public function getMonograms() {
+    return array('D');
+  }
+
   public function getRoutes() {
     return array(
       '/D(?P<id>[1-9]\d*)' => array(
diff --git a/src/applications/diffusion/application/PhabricatorDiffusionApplication.php b/src/applications/diffusion/application/PhabricatorDiffusionApplication.php
--- a/src/applications/diffusion/application/PhabricatorDiffusionApplication.php
+++ b/src/applications/diffusion/application/PhabricatorDiffusionApplication.php
@@ -44,6 +44,11 @@
     );
   }
 
+  public function getMonograms() {
+    // This is a special case, as r and R mean different things.
+    return array('r', 'R');
+  }
+
   public function getRoutes() {
     $repository_routes = array(
       '/' => array(
diff --git a/src/applications/files/application/PhabricatorFilesApplication.php b/src/applications/files/application/PhabricatorFilesApplication.php
--- a/src/applications/files/application/PhabricatorFilesApplication.php
+++ b/src/applications/files/application/PhabricatorFilesApplication.php
@@ -67,6 +67,10 @@
     );
   }
 
+  public function getMonograms() {
+    return array('F');
+  }
+
   public function getRoutes() {
     return array(
       '/F(?P<id>[1-9]\d*)(?:\$(?P<lines>\d+(?:-\d+)?))?'
diff --git a/src/applications/fund/application/PhabricatorFundApplication.php b/src/applications/fund/application/PhabricatorFundApplication.php
--- a/src/applications/fund/application/PhabricatorFundApplication.php
+++ b/src/applications/fund/application/PhabricatorFundApplication.php
@@ -36,6 +36,10 @@
     );
   }
 
+  public function getMonograms() {
+    return array('I');
+  }
+
   public function getRoutes() {
     return array(
       '/I(?P<id>[1-9]\d*)' => 'FundInitiativeViewController',
diff --git a/src/applications/harbormaster/application/PhabricatorHarbormasterApplication.php b/src/applications/harbormaster/application/PhabricatorHarbormasterApplication.php
--- a/src/applications/harbormaster/application/PhabricatorHarbormasterApplication.php
+++ b/src/applications/harbormaster/application/PhabricatorHarbormasterApplication.php
@@ -51,6 +51,10 @@
     );
   }
 
+  public function getMonograms() {
+    return array('B');
+  }
+
   public function getRoutes() {
     return array(
       '/B(?P<id>[1-9]\d*)' => 'HarbormasterBuildableViewController',
diff --git a/src/applications/herald/application/PhabricatorHeraldApplication.php b/src/applications/herald/application/PhabricatorHeraldApplication.php
--- a/src/applications/herald/application/PhabricatorHeraldApplication.php
+++ b/src/applications/herald/application/PhabricatorHeraldApplication.php
@@ -49,6 +49,10 @@
     );
   }
 
+  public function getMonograms() {
+    return array('H');
+  }
+
   public function getRoutes() {
     return array(
       '/H(?P<id>[1-9]\d*)' => 'HeraldRuleViewController',
diff --git a/src/applications/legalpad/application/PhabricatorLegalpadApplication.php b/src/applications/legalpad/application/PhabricatorLegalpadApplication.php
--- a/src/applications/legalpad/application/PhabricatorLegalpadApplication.php
+++ b/src/applications/legalpad/application/PhabricatorLegalpadApplication.php
@@ -48,6 +48,10 @@
       'open source projects keep track of Contributor License Agreements.');
   }
 
+  public function getMonograms() {
+    return array('L');
+  }
+
   public function getRoutes() {
     return array(
       '/L(?P<id>\d+)' => 'LegalpadDocumentSignController',
diff --git a/src/applications/maniphest/application/PhabricatorManiphestApplication.php b/src/applications/maniphest/application/PhabricatorManiphestApplication.php
--- a/src/applications/maniphest/application/PhabricatorManiphestApplication.php
+++ b/src/applications/maniphest/application/PhabricatorManiphestApplication.php
@@ -42,6 +42,10 @@
     );
   }
 
+  public function getMonograms() {
+    return array('T');
+  }
+
   public function getRoutes() {
     return array(
       '/T(?P<id>[1-9]\d*)' => 'ManiphestTaskDetailController',
diff --git a/src/applications/meta/controller/PhabricatorApplicationDetailViewController.php b/src/applications/meta/controller/PhabricatorApplicationDetailViewController.php
--- a/src/applications/meta/controller/PhabricatorApplicationDetailViewController.php
+++ b/src/applications/meta/controller/PhabricatorApplicationDetailViewController.php
@@ -38,6 +38,30 @@
       $header->setStatus('fa-ban', 'dark', pht('Uninstalled'));
     }
 
+    if (!$selected->isFirstParty()) {
+      $header->addTag(id(new PHUITagView())
+        ->setName('Extension')
+        ->setIcon('fa-plug')
+        ->setColor(PHUITagView::COLOR_INDIGO)
+        ->setType(PHUITagView::TYPE_SHADE));
+    }
+
+    if ($selected->isPrototype()) {
+      $header->addTag(id(new PHUITagView())
+        ->setName('Prototype')
+        ->setIcon('fa-exclamation-circle')
+        ->setColor(PHUITagView::COLOR_ORANGE)
+        ->setType(PHUITagView::TYPE_SHADE));
+    }
+
+    if ($selected->isDeprecated()) {
+      $header->addTag(id(new PHUITagView())
+        ->setName('Deprecated')
+        ->setIcon('fa-exclamation-triangle')
+        ->setColor(PHUITagView::COLOR_RED)
+        ->setType(PHUITagView::TYPE_SHADE));
+    }
+
     $timeline = $this->buildTransactionTimeline(
       $selected,
       new PhabricatorApplicationApplicationTransactionQuery());
@@ -95,6 +119,27 @@
         phutil_tag('em', array(), $application->getFlavorText()));
     }
 
+    $phids = PhabricatorPHIDType::getAllTypesForApplication(
+      get_class($application));
+
+    $user_friendly_phids = array();
+    foreach ($phids as $phid => $type) {
+      $user_friendly_phids[] = "PHID-{$phid} ({$type->getTypeName()})";
+    }
+
+    if ($user_friendly_phids) {
+      $properties->addProperty(
+        'PHIDs',
+        phutil_implode_html(phutil_tag('br'), $user_friendly_phids));
+    }
+
+    $monograms = $application->getMonograms();
+    if ($monograms) {
+      $properties->addProperty(
+        'Monograms',
+         phutil_implode_html(', ', $monograms));
+    }
+
     if ($application->isPrototype()) {
       $proto_href = PhabricatorEnv::getDoclink(
         'User Guide: Prototype Applications');
diff --git a/src/applications/meta/query/PhabricatorAppSearchEngine.php b/src/applications/meta/query/PhabricatorAppSearchEngine.php
--- a/src/applications/meta/query/PhabricatorAppSearchEngine.php
+++ b/src/applications/meta/query/PhabricatorAppSearchEngine.php
@@ -231,13 +231,13 @@
           ->setSideColumn($configure);
 
         if (!$application->isFirstParty()) {
-          $tag = id(new PHUITagView())
+          $extension_tag = id(new PHUITagView())
             ->setName(pht('Extension'))
-            ->setIcon('fa-puzzle-piece')
-            ->setColor(PHUITagView::COLOR_BLUE)
+            ->setIcon('fa-plug')
+            ->setColor(PHUITagView::COLOR_INDIGO)
             ->setType(PHUITagView::TYPE_SHADE)
             ->setSlimShady(true);
-          $item->addAttribute($tag);
+          $item->addAttribute($extension_tag);
         }
 
         if ($application->isPrototype()) {
@@ -250,6 +250,16 @@
           $item->addAttribute($prototype_tag);
         }
 
+        if ($application->isDeprecated()) {
+          $deprecated_tag = id(new PHUITagView())
+            ->setName(pht('Deprecated'))
+            ->setIcon('fa-exclamation-triangle')
+            ->setColor(PHUITagView::COLOR_RED)
+            ->setType(PHUITagView::TYPE_SHADE)
+            ->setSlimShady(true);
+          $item->addAttribute($deprecated_tag);
+        }
+
         $item->addAttribute($description);
 
         if ($application->getBaseURI() && $application->isInstalled()) {
diff --git a/src/applications/owners/application/PhabricatorOwnersApplication.php b/src/applications/owners/application/PhabricatorOwnersApplication.php
--- a/src/applications/owners/application/PhabricatorOwnersApplication.php
+++ b/src/applications/owners/application/PhabricatorOwnersApplication.php
@@ -45,6 +45,10 @@
     );
   }
 
+  public function getMonograms() {
+    return array('O');
+  }
+
   public function getRoutes() {
     return array(
       '/owners/' => array(
diff --git a/src/applications/passphrase/application/PhabricatorPassphraseApplication.php b/src/applications/passphrase/application/PhabricatorPassphraseApplication.php
--- a/src/applications/passphrase/application/PhabricatorPassphraseApplication.php
+++ b/src/applications/passphrase/application/PhabricatorPassphraseApplication.php
@@ -34,6 +34,10 @@
     return false;
   }
 
+  public function getMonograms() {
+    return array('K');
+  }
+
   public function getRoutes() {
     return array(
       '/K(?P<id>\d+)' => 'PassphraseCredentialViewController',
diff --git a/src/applications/paste/application/PhabricatorPasteApplication.php b/src/applications/paste/application/PhabricatorPasteApplication.php
--- a/src/applications/paste/application/PhabricatorPasteApplication.php
+++ b/src/applications/paste/application/PhabricatorPasteApplication.php
@@ -32,6 +32,10 @@
     );
   }
 
+  public function getMonograms() {
+    return array('P');
+  }
+
   public function getRoutes() {
     return array(
       '/P(?P<id>[1-9]\d*)(?:\$(?P<lines>\d+(?:-\d+)?))?'
diff --git a/src/applications/phame/application/PhabricatorPhameApplication.php b/src/applications/phame/application/PhabricatorPhameApplication.php
--- a/src/applications/phame/application/PhabricatorPhameApplication.php
+++ b/src/applications/phame/application/PhabricatorPhameApplication.php
@@ -31,6 +31,10 @@
     );
   }
 
+  public function getMonograms() {
+    return array('J');
+  }
+
   public function getRoutes() {
     return array(
       '/J(?P<id>[1-9]\d*)' => 'PhamePostViewController',
diff --git a/src/applications/phid/type/PhabricatorPHIDType.php b/src/applications/phid/type/PhabricatorPHIDType.php
--- a/src/applications/phid/type/PhabricatorPHIDType.php
+++ b/src/applications/phid/type/PhabricatorPHIDType.php
@@ -205,4 +205,28 @@
     return $installed_types;
   }
 
+
+  /**
+   * Get all PHID types of applications installed for a given viewer.
+   *
+   * @param PhabricatorUser Viewing user.
+   * @return dict<string, PhabricatorPHIDType> Map of constants to installed
+   *  types.
+   */
+  public static function getAllTypesForApplication(
+    string $application) {
+    $all_types = self::getAllTypes();
+
+    $application_types = array();
+
+    foreach ($all_types as $key => $type) {
+      if ($type->getPHIDTypeApplicationClass() != $application) {
+        continue;
+      }
+
+      $application_types[$key] = $type;
+    }
+
+    return $application_types;
+  }
 }
diff --git a/src/applications/pholio/application/PhabricatorPholioApplication.php b/src/applications/pholio/application/PhabricatorPholioApplication.php
--- a/src/applications/pholio/application/PhabricatorPholioApplication.php
+++ b/src/applications/pholio/application/PhabricatorPholioApplication.php
@@ -32,6 +32,10 @@
     );
   }
 
+    public function getMonograms() {
+        return array('M');
+    }
+
   public function getRoutes() {
     return array(
       '/M(?P<id>[1-9]\d*)(?:/(?P<imageID>\d+)/)?' => 'PholioMockViewController',
diff --git a/src/applications/phurl/application/PhabricatorPhurlApplication.php b/src/applications/phurl/application/PhabricatorPhurlApplication.php
--- a/src/applications/phurl/application/PhabricatorPhurlApplication.php
+++ b/src/applications/phurl/application/PhabricatorPhurlApplication.php
@@ -37,6 +37,10 @@
     );
   }
 
+  public function getMonograms() {
+    return array('U');
+  }
+
   public function getRoutes() {
     return array(
       '/U(?P<id>[1-9]\d*)/?' => 'PhabricatorPhurlURLViewController',
diff --git a/src/applications/ponder/application/PhabricatorPonderApplication.php b/src/applications/ponder/application/PhabricatorPonderApplication.php
--- a/src/applications/ponder/application/PhabricatorPonderApplication.php
+++ b/src/applications/ponder/application/PhabricatorPonderApplication.php
@@ -47,6 +47,10 @@
         pht('Learn More')));
   }
 
+  public function getMonograms() {
+    return array('Q');
+  }
+
   public function getRoutes() {
     return array(
       '/Q(?P<id>[1-9]\d*)'
diff --git a/src/applications/slowvote/application/PhabricatorSlowvoteApplication.php b/src/applications/slowvote/application/PhabricatorSlowvoteApplication.php
--- a/src/applications/slowvote/application/PhabricatorSlowvoteApplication.php
+++ b/src/applications/slowvote/application/PhabricatorSlowvoteApplication.php
@@ -45,6 +45,10 @@
     );
   }
 
+  public function getMonograms() {
+    return array('V');
+  }
+
   public function getRoutes() {
     return array(
       '/V(?P<id>[1-9]\d*)' => 'PhabricatorSlowvotePollController',
diff --git a/src/applications/spaces/application/PhabricatorSpacesApplication.php b/src/applications/spaces/application/PhabricatorSpacesApplication.php
--- a/src/applications/spaces/application/PhabricatorSpacesApplication.php
+++ b/src/applications/spaces/application/PhabricatorSpacesApplication.php
@@ -49,6 +49,10 @@
     );
   }
 
+  public function getMonograms() {
+    return array('S');
+  }
+
   public function getRoutes() {
     return array(
       '/S(?P<id>[1-9]\d*)' => 'PhabricatorSpacesViewController',