経 is built from the 糸 and 巠 (warp thread (in 経·軽)) components.
It belongs to a phonetic family with 軽, 径, and 茎 — they share the 巠 component and the reading ケイ.
A common word using 経 is 経験 (けいけんする), meaning “experience”.
Don't confuse it with 径, 軽, and 茎.