瑛 is built from the 王, 艹 (grass (top)), and 央 components.
It belongs to a phonetic family with 映 and 英 — they share the 央 component and the reading エイ.
A common word using 瑛 is 玉瑛 (ぎょくえい), meaning “crystal; transparent gem”.
Kanji that look similar include 琴, 着, 程, and 望.