Countersign
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
To sign what has already been signed by a superior; to authenticate by an additional signature.
40 111. 167.
COUNTEZ (Law Fr. count, or reckon). In old practice. A direction formerly given Blackstone says was given in his time, in good English, "count these."
4 Bl. Comm. 340, note (u).