Signum
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
Lat In the Roman and civil law. A sign; a mark; a seal. The seal of an Instrument.
Calvin.
A species of proof. By "signa" were meant those species of indicia which come more immediately under the cognizance of the senses; such as stains of blood on the person of the accused.
Best, Pres. 13, note f.
In Saxon law. The sign of a cross prefixed as a sign of assent and approbation to a charter or deed.