央 is built from the 大 and 冂 (open box / border) components.
It belongs to a phonetic family with 映, 英, and 瑛 — they share the 央 component and the reading エイ.
A common word using 央 is 中央 (ちゅうおう), meaning “central, center, middle”.
Kanji that look similar include 因, 天, 太, and 大.