Change "single tap" mod acronym to not conflict with "strict tracking"

osu.Game.Rulesets.Osu/Mods/OsuModSingleTap.cs

@@ -9,7 +9,7 @@ namespace osu.Game.Rulesets.Osu.Mods
     public class OsuModSingleTap : InputBlockingMod
     {
         public override string Name => @"Single Tap";
-        public override string Acronym => @"ST";
+        public override string Acronym => @"SG";
         public override string Description => @"You must only use one key!";
         public override Type[] IncompatibleMods => base.IncompatibleMods.Concat(new[] { typeof(OsuModAlternate) }).ToArray();
 

osu.Game.Tests/Visual/Gameplay/TestSceneNoConflictingModAcronyms.cs

@@ -0,0 +1,27 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+#nullable disable
+using System.Collections.Generic;
+using System.Linq;
+using NUnit.Framework;
+using osu.Framework.Testing;
+
+namespace osu.Game.Tests.Visual.Gameplay
+{
+    [HeadlessTest]
+    public class TestSceneNoConflictingModAcronyms : TestSceneAllRulesetPlayers
+    {
+        protected override void AddCheckSteps()
+        {
+            AddStep("Check all mod acronyms are unique", () =>
+            {
+                var mods = Ruleset.Value.CreateInstance().AllMods;
+
+                IEnumerable<string> acronyms = mods.Select(m => m.Acronym);
+
+                Assert.That(acronyms, Is.Unique);
+            });
+        }
+    }
+}