ἀκόνα
From LSJ
προγράψαντες οὖν τά τε θεωρήματα καὶ τὰ ἐπιτάγματα τὰ χρεῖαν ἔχοντα εἰς τὰς ἀποδείξιας αὐτῶν μετὰ ταῦτα γραψοῦμές τοι τὰ προκείμενα → having therefore written at the beginning the theorems and the postulates that are necessary for their proofs, we will then write out for you the propositions
English (Slater)
ᾰκόνα whetstone φαίης κέ νιν ἄνδρ' ἐν ἀεθληταῖσιν ἔμμεν Ναξίαν πέτραις ἐν ἄλλαις χαλκοδάμαντ ἀκόναν i. e. Lampon, who trained his sons (I. 6.73) met. δόξαν ἔχω τινἐπὶ γλώσσᾳ λιγυρᾶς ἀκόνας (Bergk: ἀκόνας λιγυρᾶς codd.: sens. dub., a reputation for clear sounding whetting of the praises of men? ) (O. 6.82)