n.

a secret word or phrase known only to a restricted group

同義詞：passwordwatchwordwordparole

a second confirming signature endorsing a document already signed

同義詞：countersignature

Signs and countersigns
In the Event: Indigenous Countersigns and the Ethnohistory of Voyaging
Communication model, counter sign signal, method, and device
GPs Decide Not To Countersign Applications For Gun Licences
A digital contract countersign service platform oriented to supply chain market
Art. 74 of Constitution of Japan and "an influence of afterglow of countersign under the former Constitution"
Daniel Libeskind : countersign
Daniel Libeskind : Countersign
Countersign /
Starting out - I felt pressured to countersign for controlled medications: Student experiences in the real world of nursing