署名 (signature) + 欄 (column, field on a form). The suffix 欄 names any labeled blank on a document: 住所欄 (address field), 備考欄 (remarks field).
Common collocations
- 署名欄に記入する: to fill in the signature field
- 署名欄にサインする: to sign in the signature field
- 署名欄が空欄: the signature field is blank
Similar words
- 捺印欄: seal field — the space for a personal seal, which many Japanese documents require instead of or alongside a signature
- 記入欄: entry field — any blank to be filled in, not specifically for a name