countersignature
Noun
Meaning
a second confirming signature endorsing a document already signed
Source: WordNetSynonyms
Hypernyms
Examples
A countersignature by the head of government is, nevertheless, required.
Article 115, para. 2 In accordance to Poland's parliamentary system, most official acts of the presidency require the prime minister's countersignature in order to become valid.
Ludwikowski, p. 14 The executive branch could select and organize cabinets (with the Sejm's consent), be responsible to the ministries for their duties, and require the countersignature of ministers for all official acts.