璽 means “imperial seal”

じ · ji

Also: emperor's seal

On'yomi (Chinese reading)
ジ

JLPT N1 · Taught in secondary school · 19 strokes

The story

A jewel (玉) under 爾, a dense lattice of strokes: picture the carved face of a great seal. 璽 is a sovereign's seal: Japan's laws are stamped with the 御璽, a square gold seal reading 天皇御璽, and the 国璽 marks certificates of national honors.

Used in 御璽 (gyoji, the Emperor's seal) and 国璽 (kokuji, the state seal)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.