internal subprogram
Computing term for a subprogram defined within another program or module, accessible only within that scope.
この言語では、内部副プログラムは外部から直接呼び出せない。
In this language, internal subprograms cannot be called directly from outside.
Compound of 内部 (internal) and 副プログラム (subprogram), a direct calque from English computing terminology.