θριαί
From LSJ
κρατίστην εἶναι δημοκρατίαν τὴν μήτε πλουσίους ἄγαν μήτε πένητας ἔχουσαν πολίτας → the best democracy is that in which the citizens are neither very rich nor very poor (Thales/Plutarch)
English (LSJ)
ῶν, αἱ,
A pebbles used in divination, Philoch.196, Call.Ap.45, cf. Sch. ad loc., EM455.34. II personified as nymphs of Parnassus, Philoch. l.c., Sch.Call.l.c., dub. cj. in h.Merc.552.