Lexical Definition

‎σύσσημον‎ sýssēmon (soos'-say-mon) an agreed signal ^G:N-N
neuter of a compound of ‎σύν‎ and the base of ‎σημαίνω‎

token.

• a sign in common, i.e. preconcerted signal

Abbott-Smith

† σύσ-σημον (T, συν-), -ου, τό (< σῆμα), [in LXX: Jg 20:38, 40 (מַשְׂאֵת), Is 5:26 49:22 62:10 (נֵס) * ;]
a fixed sign or signal: Mk 14:44. (Strab., Plut., al.; condemned by Atticists, v. Rutherford, NPhr., 492 f.) †

Abbott-Smith References

Liddell-Scott-Jones

σύσσημον-ον, τό,

={σύμβολον}, signal, [Refs 4th c.BC+]; δεδώκει σ. [LXX+NT]; αἴρειν τὸ σ. [Refs 1st c.BC+]; ἦρε τὸ συγκείμενον πρὸς μάχην σ. [Refs]

__2 stamp on weights and measures, ἀπὸ συσσήμου πωλεῖν [Refs 1st c.BC+]
__3 badge, ensign, τὰ τῆς ἀρχῆς σ. insignia, regalia, [Refs 1st c.BC+]; token, means of recognition, [Refs 4th c.BC+]
__4 pledge, pawn, [Refs 3rd c.BC+]

_{LSJ Scripture Refs: Mark.14.44 ☩ LXX.Judg.20.40}