席 is a Chinese hanzi, listed here under the keyword “seat”. It is built from 广 (wide), 廿 (twenty) and 巾 (kerchief). It appears as a component in 2 other characters in this index.
On KumiJi Glyph Explorer, open the parts search and type “wide” + “twenty” + “kerchief”. 席 is among the results, together with every other character containing the same shapes.
Open 席 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.