signum
signum, -i n.
noun, 2nd declension
si-gnum · /ˈsi.ɲum/
sign, mark, standard
Signum fídei, the sign of faith, has meant baptism since antiquity; that is how the Canon speaks of the baptized dead.
in English sign, signal, design
in the texts
Meménto étiam (pro defúnctis) signo
external dictionary: Logeion