Tetriminos is a common variant spelling of tetrominoes, the four-block shapes made famous by Tetris, created in 1984 by Alexey Pajitnov. Each piece is built from four squares joined in different arrangements, and players rotate them to complete horizontal lines. Online, the name and its sounds became shorthand for retro puzzle gaming, perfect fits and things stacking neatly into place. Creators still use it because the reference is instantly understood across generations of players worldwide today.