σιγμός
From LSJ
ἀλλ' ἦν ἅπαντα τεταγμένα νόμων ἐπιταγαῖς → but all their acts were regulated by prescriptions set forth in laws
English (LSJ)
ὁ, (σίζω)
A hissing, as of tortoises, Arist.HA536a7; as a signal, Plu.2.593b; in Magic, Plot.2.9.14; in Gramm., of sibilants, D.T.631.18, Phld.Po.Herc.994.33, S.E.M.1.102.