錠 is built from the 金, 宀 (roof), and 正 components.
It reads ジョウ like 正, as do 政, 定, 証, and 従 — learn 正 once and the family's reading comes with it.
A common word using 錠 is 手錠 (てじょう), meaning “handcuffs, manacles”.
Kanji that look similar include 鋼, 錦, 錬, and 錯.
