noun
initializer
Computing term for a routine or expression that sets initial values for variables or objects.
C++では、コンストラクタの初期化子リストを使うと効率的にメンバ変数を初期化できる。
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').