S / signācŭlum
noun

signācŭlum

gen. signācŭli · gender neuter · decl. 2nd
a mark; a sign
In gen., a mark, a sign (post-class.): corporis, i.e. circumcision, Tert. Apol. 21: frontis inscripta oleo, i.e. the sign of the cross, Prud. Psych. 360.—
a seal; signet
In partic., a seal, signet, App. Flor. 2, p. 346; Dig. 16, 3, 1, § 36; Novat. Th. 2, tit. 16, c. 1, § 5.