Triomino -- from Wolfram MathWorld

A triomino, also known as a tromino, is a 3-polyomino. There are two free polyominoes, (the same) two one-sided polyominoes, and 6 fixed polyominoes. The free polyominoes are known as the L-triomino (or right triomino) and straight triomino, respectively. There is also a game called triomino consisting of 55 equilateral triangles, each containing three numbers from 0 to 5 at each vertex. Every combination of tiles is in the game, although those tiles with three different values are allowed

Pythagorean Quadruple -- from Wolfram MathWorld

Trinomial Coefficient -- from Wolfram MathWorld

A (2^k) × (2^k) chessboard has one of its squares missing. Can you

Tessellation Patterns - From Mathematics to Art

Comparing Voting Systems for a Normal Distribution of Voters

Connected Sum -- from Wolfram MathWorld

Règles du Triominos - Comment jouer au Triominos ?

Polyomino -- from Wolfram MathWorld

Penrose Tilings and Wieringa Roofs - Wolfram Demonstrations Project

A (2^k) × (2^k) chessboard has one of its squares missing. Can you

A (2^k) × (2^k) chessboard has one of its squares missing. Can you

Générateur de Triominos – It's English O'Clock!

Exploring Tetris as a Transformation Semigroup