Countersigned

His usual procedure is to review and have documents countersigned by authorized personnel before signing.

On legal documents, an illiterate signatory can make a "mark" (often an "X" but occasionally a personalized symbol), so long as the document is countersigned by a literate witness.

The president can also exercise certain emergency powers, which must be countersigned by the appropriate cabinet minister.

The Proclamation which you have just heard read by the Governor-General's Official Secretary was countersigned Malcolm Fraser, who will undoubtedly go down in Australian history from Remembrance Day 1975 as Kerr's cur.