Where the Name "Tetris" Comes From

A Greek numeral prefix welded to the name of a racquet sport, because the author liked both.

The name is a portmanteau of two things its author liked: the Greek prefix tetra-, meaning four, and tennis, the sport Pajitnov played. Tetra plus tennis, contracted, gives Tetris.

That is the whole explanation, and it is a good reminder that the names which end up on millions of boxes are usually not the product of a naming agency.

Why "four"

Every piece in the game is made of exactly four squares. The mathematical term for such a shape is a tetromino — again from tetra-, by analogy with "domino". There are exactly seven distinct tetrominoes if you treat rotations of the same shape as identical, which is why the game has seven pieces and not some rounder number. The count is a fact about geometry, not a design choice.

If Pajitnov had stayed with five-square shapes, the game would have had twelve pieces and, presumably, a different name.

The vocabulary that grew around it

The prefix has proved unreasonably productive. Clearing four rows at once with the long straight piece is called a tetris in ordinary play, lower-cased, as a common noun — a rare case of a product name being used as the name of a move within its own game. The naming convention spread outward from there: communities coined T-spin, back-to-back and dozens of setup names, most of which have no official standing and were simply adopted because they were useful.

What TETERI is called, and why

This game's name follows the same logic and none of the same trademark: a short made-up word that sounds like what it is. It is an independent game, unrelated to and unaffiliated with the company that owns the older name. Its own four-row clear is called a Teteris, which is a joke about exactly the naming pattern described above.

Names in this genre have always been a bit silly. That seems appropriate for something whose entire subject is fitting rectangles into other rectangles.

Read next

• Who Invented Tetris?Alexey Pajitnov wrote the original in 1984 at a Soviet research institute, on a computer that could not draw graphics.
• The First Version Ran on a Computer That Could Not DrawThe Elektronika 60 had no graphics mode, so the original pieces were built out of punctuation marks.
• How the Game Escaped the Soviet UnionIt spread by informal copying, reached Hungary, and was picked up by a Western agent before anyone had signed anything.
• ELORG and the Most Confusing Licence in GamesA Soviet state agency, a chain of Western sublicences, and a fight over what the word "computer" means.
• Accessibility in Puzzle Games, and Where It Runs OutSome barriers in this genre are removable. One of them, so far, is not.
• The Back-to-Back Bonus, and What Counts as DifficultChain four-row clears and T-spins without an ordinary clear between them, and everything is worth half again as much.