TOWO Wooden Tangram T Puzzle for Kids – Wooden Pattern Blocks Geometric Shapes Montessori Toy Large Size with 100 Solutions- Travel Games – Smart Brain Teaser IQ Logic Puzzle for Children and Adults – TopToy
T-puzzle-template - Double Helix
Gabriel Fernandes' Puzzle Collection: T-Puzzle
File:Generalised T puzzle solutions.gif - Wikimedia Commons