diff --git a/data/aliases.ts b/data/aliases.ts
index 33af770439..4ad093acfe 100644
--- a/data/aliases.ts
+++ b/data/aliases.ts
@@ -409,6 +409,34 @@ export const BattleAliases: {[alias: string]: string} = {
 	miniorblue: "Minior",
 	miniorindigo: "Minior",
 	miniorviolet: "Minior",
+	unownb: "Unown",
+	unownc: "Unown",
+	unownd: "Unown",
+	unowne: "Unown",
+	unownf: "Unown",
+	unowng: "Unown",
+	unownh: "Unown",
+	unowni: "Unown",
+	unownj: "Unown",
+	unownk: "Unown",
+	unownl: "Unown",
+	unownm: "Unown",
+	unownn: "Unown",
+	unowno: "Unown",
+	unownp: "Unown",
+	unownq: "Unown",
+	unownr: "Unown",
+	unowns: "Unown",
+	unownt: "Unown",
+	unownu: "Unown",
+	unownv: "Unown",
+	unownw: "Unown",
+	unownx: "Unown",
+	unowny: "Unown",
+	unownz: "Unown",
+	unownexclamation: "Unown",
+	unownquestion: "Unown",
+
 	pokestargiant2: "Pokestar Giant",
 	pokestarmonica2: "Pokestar Giant",
 	pokestarufopropu1: "Pokestar UFO",
diff --git a/server/ladders.ts b/server/ladders.ts
index 587fe43c7f..6f574e3010 100644
--- a/server/ladders.ts
+++ b/server/ladders.ts
@@ -103,10 +103,15 @@ class Ladder extends LadderStore {
 			return null;
 		}
 
-		const regex = /(?:^|])([^|]*)\|/g;
+		const regex = /(?:^|])([^|]*)\|([^|]*)\|/g;
 		let match = regex.exec(team);
+		let unownWord = '';
 		while (match) {
 			let nickname = match[1];
+			const speciesid = toID(match[2] || match[1]);
+			if (speciesid.length <= 6 && speciesid.startsWith('unown')) {
+				unownWord += speciesid.charAt(5) || 'a';
+			}
 			if (nickname) {
 				nickname = Chat.nicknamefilter(nickname, user);
 				if (!nickname || nickname !== match[1]) {
@@ -119,6 +124,16 @@ class Ladder extends LadderStore {
 			}
 			match = regex.exec(team);
 		}
+		if (unownWord) {
+			const filtered = Chat.nicknamefilter(unownWord, user);
+			if (!filtered || filtered !== unownWord) {
+				connection.popup(
+					`Your team was rejected for the following reason:\n\n` +
+					`- Your Unowns spell out a banned word: ${unownWord.toUpperCase()}`
+				);
+				return null;
+			}
+		}
 
 		let rating = 0;
 		let valResult;