Wikipedia
Tsukahara (vault)
The Tsukahara can refer to a specific vault and a family of vaults in artistic gymnastics. The first Tsukahara vault was performed by (and named after) Mitsuo Tsukahara in 1972.
A Tsukahara vault consists of a half turn off the springboard onto the vault table, then a push backwards, usually into a back salto or layout.