弦 is a Chinese hanzi, listed here under the keyword “string”. It is built from 弓 (bow) and 玄 (deep). It appears as a component in 4 other characters in this index.
On KumiJi Glyph Explorer, open the parts search and type “bow” + “deep”. 弦 is among the results, together with every other character containing the same shapes.
Open 弦 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.