sī silk; thread (left-side form)

Forms

• 糸 free — Traditional standalone form of the silk radical.
• 纟 left — Simplified three-stroke form, written on the left of a character.

Characters that use it as a component

纠红纤约级纪纫纬

Characters filed under it as a radical

Kangxi radical no.120 · 糸 · 6strokes — The 214 Kangxi radicals

Filed under it in a dictionary. That is a lookup convention — it does not mean it is the only part the character is built from.

系红纤纪紊素索紧