final character; terminal character
Computing term for the last character in a string, file, or data sequence. Often used in contexts like null-terminated strings or end-of-file markers.
C language strings use a null character as the final character.
Please check the final character of the file.
終端 means 'end' or 'terminal' in general, while 終端文字 specifically refers to the final character in a computing context.
ヌル文字 is the null character often used as a 終端文字 in programming.
Compound of 終端 (terminal, end) and 文字 (character). A straightforward technical term.