initializer
Computing term for a routine or expression that sets initial values for variables or objects.
In C++, using a constructor initializer list allows efficient initialization of member variables.
初期化 is the general process of initialization, while 初期化子 specifically refers to the initializer construct in programming.
Compound of 初期化 (initialization) + 子 (a suffix used in computing for entities like 'element' or 'object').