σφραγιστήριον
From LSJ
δός μοι πᾷ στῶ καὶ τὰν γᾶν κινήσω → give me a place to stand and I will move the earth, give me a place to stand and I'll move the earth, give me the place to stand and I shall move the earth, give me a place to stand and with a lever I will move the whole world, give me a firm spot to stand and I will move the world, give me a lever and a place to stand and I will move the earth, give me a fulcrum and I shall move the world
English (LSJ)
τό,
A seal, stamp, PLond.5.1657.13 (iv/v A.D.); = signaculum, signatorium, Gloss.
German (Pape)
[Seite 1052] τό, Siegel, Petschaft, Sp.