印鑑 (inkan) means “seal” | MotiTan Japanese Dictionary

More examples

不動産の契約には印鑑が必要です。fu dō san no kei yaku ni wa in kan ga hitsu yō de su

A seal is required for a real estate contract.

A physical seal acts as a personal mark that confirms identity or approval when it is pressed onto a document.

判子hanko: A common everyday term for a seal used to mark documents.
印章inshō: A formal term for a seal used to mark documents.

書類などに押し、本人の身分や意思を示すための印章。sho rui na do ni o shi hon nin no mi bun ya i shi o shime su ta me no in shō

The Sino-Japanese compound combines 印 (in, "mark") and 鑑 (kan, "model or standard") to form 印鑑 (inkan), a seal used to confirm identity or approval.

In Japan, 印鑑 (inkan) has traditionally been used for bank and official procedures, so a seal can function where an English-speaking country might expect a signature.