character body; character frame
Computing term referring to the rectangular area occupied by a character, including internal spacing and the space between characters.
Adjust the character body size to change the character spacing.
フォント枠 is a broader term for the font's bounding box, whereas 文字枠 specifically refers to the character body in typesetting or computing.
Compound of 文字 (moji, 'character') and 枠 (waku, 'frame, box').