What is the name of the educational toy of the same 12 roots

I don't know if it's this one - Kongming lock, is an ancient Chinese traditional civil engineering construction fixed bonding device, which originated from the first mortise and tenon structure in ancient Chinese architecture. Legend has it that it was invented by Lu Ban in the late Spring and Autumn period to the early Warring States period. (Another legend has it that Zhuge Liang invented it during the Three Kingdoms period.) This three-dimensional plugging apparatus internal concave and convex parts (i.e., mortise and tenon structure) meshing, very skillful. Lu Ban locks are more toys with different shapes and internal constructions, which are generally easy to dismantle and difficult to assemble. When assembling, you need to observe closely, think carefully and analyze its internal structure. It is conducive to the development of the brain, flexible fingers, and is a good educational toy. Can you cross-fix six wooden strips together without nails and strings? The carpenter ancestor then invented a way to fix three sets of wooden strips vertically intersecting each other with a kind of biting, this kind of biting is widely used in construction, and in the Three Kingdoms period Kong Ming made this invention of Luban into a kind of toy--Kong Ming Lock. Original for the wooden structure, the appearance is a tightly sealed cross cube, brain can be disassembled, loaded is not so easy. Reproduce ancient wisdom, do not let the ancients left us the wealth lost in the hands of our generation.