軽 is built from the 車 and 巠 (warp thread (in 経·軽)) components.
It belongs to a phonetic family with 経, 径, and 茎 — they share the 巠 component and the reading ケイ.
A common word using 軽 is 軽い (かるい), meaning “light, non-serious, minor”.
Don't confuse it with 径, 経, and 茎.
