In geometry, the gyrobifastigium is the 26th Johnson solid (J26). It can be constructed by joining two face-regular triangular prisms along corresponding square faces, giving a quarter-turn to one prism. It is the only Johnson solid that can tile three-dimensional space.
https://en.wikipedia.org/wiki/Gyrobifastigium
Approximately 2.5" long. Available in your choice of 2 different colors.
