系 is a simplified Chinese hanzi, listed here under the keyword “system”. It is built from 丿 (line) and 糸 (silk). It appears as a component in 9 other characters in this index.
On KumiJi Glyph Explorer, open the parts search and type “line” + “silk”. 系 is among the results, together with every other character containing the same shapes.
Open 系 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.