countersign (n.)
- amen
- autograph
- badge
- card
- cipher
- countersignature
- credentials
- cross
- device
- endorsement
- guarantee
- hand
- identification
- initial
- mark
- monogram
- pass
- password
- permit
- pledge
- plight
- promise
- sanction
- seal
- second
- shibboleth
- sign
- signature
- signet
- subscription
- support
- swear
- tessera
- token
- troth
- visa
- vise
- vow
- warrant
- watchword
- word
countersign (v.)
- accept
- accredit
- affirm
- approve
- assure
- authenticate
- authorize
- autograph
- avouch
- badge
- card
- certify
- cipher
- confirm
- cosign
- cross
- endorse
- guarantee
- hand
- initial
- mark
- notarize
- pass
- permit
- pledge
- plight
- promise
- ratify
- sanction
- seal
- second
- sign
- support
- swear
- token
- troth
- undersign
- underwrite
- validate
- visa
- vise
- vouch
- vow
- warrant
- word
