visa (n.)
- acceptance
- affidavit
- affirmation
- approbation
- approval
- attestation
- authentication
- authority
- authorization
- autograph
- certificate
- certification
- cipher
- clearance
- confirmation
- countersign
- countersignature
- credential
- cross
- deposition
- device
- diploma
- endorsement
- go-ahead
- hand
- imprimatur
- mark
- monogram
- nod
- note
- okay
- pass
- passport
- permission
- protection
- ratification
- safe-conduct
- safeguard
- sanction
- seal
- sheepskin
- signature
- signet
- stamp
- subscription
- testimonial
- ticket
- validation
- vise
- voucher
- warrant
- warranty
- witness
