This character is an old variant of 矩, meaning a rule or standard.
Tips
usage
榘 is an old written variant of 矩 (carpenter's square; rule). Modern writing uses 矩 almost exclusively, as in 规矩 (rules; manners). Recognize 榘 but write 矩.
The top is the standard character 矩 itself, giving both sound jǔ and the full meaning 'carpenter's square'. This variant simply restacks it above a wood element.
木 adds 'wood' at the bottom, underlining that a carpenter's square is a wooden measuring tool. It reinforces, rather than changes, the meaning carried by 矩 on top.
