noun
Computing term for the trailing part of a data structure, file, or packet, often containing metadata or end markers.
このファイル形式では、終端部にチェックサムが格納されている。
In this file format, a checksum is stored in the trailer.
Compound of 終端 (terminal, end) and 部 (part, section). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.