σφραγίς, -ῖδος, ἡ

[in LXX: Exo.28:11, al. (חוֹתָם) Exo.35:22 (חָח), Sir.17:22, al. ;]

__1. a seal, signet: Rev.7:2.

__2. The impression of a seal or signet, a seal (on its various purposes, see: σφραγίζω): on a book or roll, Rev.5:1-2, 5 5:9 6:1, 3 6:5, 7 6:9, 12 8:1; metaphorically, Rom.4:11, 1Co.9:2, 2Ti.2:19, Rev.9:4.†

(AS)

a seal, signet; a seal