draft angle
Technical term in manufacturing and mold design; refers to the slight taper on a mold or casting to facilitate removal of the finished part. Compare 抜きしろ (draft allowance).
See also: 抜きしろ (ぬきしろ)
A draft angle is necessary for the mold.
Compound of 抜き (removal, extraction) and 勾配 (slope, gradient). The exact historical derivation is uncertain; the term is used in modern engineering contexts.