Refers to the physical seal or seam of an envelope or similar closure. Often used in formal or written contexts.
See also: 緘する (かんする)
I cut the seal of the envelope.
writing on a seal
Specifically the characters or words written across the seal of an envelope, such as 〆 or 緘. Rare standalone use; more often encountered in compound or explanatory contexts.
Write '〆' on the seal part of the envelope.
gag order; gag rule; gag law
seal (letters, documents, etc.)
your letter (honorific)
seal; shut; close · silence; gag; muzzle
The kanji 緘 is composed of 糸 (thread) and 咸 (all, together), suggesting the idea of binding or sealing with thread. The reading かん is the on'yomi.