A tetramino is an hat item that resembles a Tetromino from Tetris. The first tetramino was released on January 13, 2018, which is now a deleted item.
List of Tetraminos
Patriotic Tetramino Of Terror
Released on January 13, 2018
This item was made to "spook" other players because people spammed "I would actually want a gold tetramino", which was started by Its Madness. It was uploaded as a T-Shirt, and it was created by Jefemy. The item was renamed to "sorry typo" a few minutes later. This item only lasted for a few minutes.