U+74BD CJK Unified Ideo­graph-​74BD

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In the Sinosphere, seals (stamps) can be applied on objects to establish personal identification. They are commonly applied on items such as personal documents, office paperwork, contracts, and art. They are used similarly to signatures in the West. Unlike in the West, where wax seals are common, Sinosphere seals are used with ink.

Of Chinese origin, the process soon spread beyond China and across East and Southeast Asia. Various countries in these regions currently use a mixture of seals and hand signatures, and, increasingly, electronic signatures.

Chinese seals are typically made of stone, sometimes of metals, wood, bamboo, plastic, or ivory, and are typically used with red ink or cinnabar paste (Chinese: 朱砂; pinyin: zhūshā) 朱砂. The word 印 ("yìn" in Mandarin, "in" in Japanese and Korean, "ấn" and "in" in Vietnamese) specifically refers to the imprint created by the seal, as well as appearing in combination with other morphemes in words related to any printing, as in the word "印刷", "printing", pronounced "yìnshuā" in Mandarin, "insatsu" in Japanese. In the western world, Asian seals were traditionally known by traders as chop marks or simply chops, a term adapted from the Hindi chapa and the Malay cap, meaning stamp or rubber stamps.

In Japan, seals, referred to as inkan (印鑑) or hanko (判子), have historically been used to identify individuals involved in government and trading from ancient times. The Japanese emperors, shōguns, and samurai had their personal seals pressed onto edicts and other public documents to show authenticity and authority. Even today, Japanese citizens' companies regularly use name seals for the signing of a contract and other important paperwork.