舊 is a traditional Chinese hanzi, listed here under the keyword “old”. It is built from 萑 (grass used for making mats) and 臼 (mortar). It appears as a component in 3 other characters in this index.
On KumiJi Glyph Explorer, open the parts search and type “grass used for making mats” + “mortar”. 舊 is among the results, together with every other character containing the same shapes.
Open 舊 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.