KanjiJLPT N2
Stamp

stamp, seal, mark, imprint, symbol, emblem, trademark, evidence, souvenir, India

Mnemonic

You dip a comb in red ink and press it onto parchment, creating a stamp. The stamp left behind reveals perfectly parallel teeth marks — a unique seal no forger could ever replicate. Officials everywhere adopt this comb-seal method.
Additional thoughts
Picture the comb's teeth leaving crisp parallel grooves in red ink on official documents. The comb IS the stamp — a clever improvised seal that becomes your personal mark of authority.
Quick recall
A comb pressed in ink becomes a stamp, leaving a unique stamp seal.

Details

The keyword for 印 is stamp. This kanji refers to a seal, stamp, or mark used to make an impression, much like the traditional ink stamps used in East Asian cultures as personal signatures or official marks of authority. It encompasses the ideas of printing, imprinting, and leaving a visible mark on a surface. By extension, it can also convey the broader concept of an impression or sign left behind.
On'yomi
いん
Kun'yomi
しるし、-じるし、しる.す