feat: https://github.com/NodeBB/NodeBB/issues/10234

less/mobile.less

@@ -58,7 +58,11 @@
 		html[data-dir="rtl"] button& {
 			margin-left: 0;
 		}
-
+		&#mobile-menu {
+			.unread-count::after {
+				left: 32px;
+			}
+		}
 		.header & .notification-icon {
 			left: auto;
 			right: 7px;

templates/partials/menu.tpl

@@ -1,6 +1,6 @@
 			<div class="navbar-header">
 				<button type="button" class="navbar-toggle pull-left" id="mobile-menu">
-					<i class="fa fa-lg fa-fw fa-bars"></i>
+					<i class="fa fa-lg fa-fw fa-bars unread-count" data-content="{unreadCount.topic}"></i>
 				</button>
 				{{{ if config.loggedIn }}}
 				<button type="button" class="navbar-toggle" id="mobile-chats">