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.
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.