noun
carriage return; return (LF+CR)
Technical computing term for the carriage return control character or the combined line feed and carriage return sequence.
テキストファイルの行末には復改コードが含まれている。
The end of each line in a text file contains a carriage return code.
改行 is the general term for a line break or newline, while 復改 specifically refers to the carriage return character or the CR+LF sequence.
Compound of 復 (return) and 改 (renew/revise), likely a modern technical coinage for 'carriage return'.