red seal; vermilion seal
A seal stamped in red ink, historically used on official documents, licenses, and by the Tokugawa shogunate for foreign trade permits (朱印状).
This old document bears a red seal.
Red-seal ship trade was conducted in the early Edo period.
The official stamped the document with a red seal.
I received a red seal stamp at the shrine.
My hobby is collecting red seal stamps from shrines and temples I visit.
印章 is the formal, generic term for a seal or its imprint, while 朱印 narrows this to the red-colored seal used on official documents or shrine stamps.
御朱印 is the polite, modern term for the red seal stamps collected at shrines and temples, while 朱印 is the plainer word covering both this and historical official seals.
Compound of 朱 (vermilion, red) and 印 (seal, stamp). The term is straightforward and its meaning is transparent from its components.