σύριγμα
From LSJ
Δεῖ τοὺς φιλοῦντας πίστιν, οὐ λόγους ἔχειν → Non bene stat intra verba amicorum fides → Vertrauen müssen Freunde sich, viel reden nicht
English (LSJ)
[ῡ], ατος, τό,
A sound of a pipe, in pl., E.Ba.952, Ar.Ach. 554; whistling, κυνορτικὸν σ. S.Ichn.167; ἀνέμων Orph.H.34.25; hissing of the serpent Pytho, Pae.Delph.20 (pl.).