Computing term for the control character that moves the cursor to the beginning of the line.
Text files sometimes contain a carriage return character at the end of each line.
改行 refers to a line feed or newline, moving to the next line, while 復帰文字 specifically means carriage return, moving the cursor to the start of the current line.
Compound of 復帰 (return) and 文字 (character), a direct translation of the English computing term 'carriage return'.