initialization section
Computing term referring to the part of a program or process where variables, hardware, or data structures are set to their initial states.
In the initialization section of the program, initial values are assigned to variables.
初期化 is the general process of initialization, while 初期化部 specifically refers to the section or part of code that performs initialization.
Compound of 初期化 (initialization) + 部 (section, part). A straightforward technical term.