joint signatures; co-signing
Refers to the act of multiple people signing a document together, or the signatures themselves. Often used in legal, business, or formal petition contexts.
The petition gathered many joint signatures from citizens.
Please check the contents carefully before co-signing the contract.
署名 is a single signature, while 共同署名 specifically means multiple people signing together.
連署 also means joint signing, but is often used in more formal or official contexts such as legal documents or joint statements.
Compound of 共同 (joint, cooperative) and 署名 (signature). The exact historical derivation is uncertain, but the word follows standard Sino-Japanese compounding patterns.