μνημονεῖον
From LSJ
λέγεις, ἃ δὲ λέγεις ἕνεκα τοῦ λαβεῖν λέγεις → you speak, but you say what you say for the sake of gain (Menander, fr. 776)
English (LSJ)
or μνημόν-ιον, τό, A registry, PRein.18.8 (ii B. C.), POxy.1282.22 (i A. D.), etc.
Greek (Liddell-Scott)
μνημονεῖον: τό, = τῷ προηγ., Μαρτύρ. Ἁγ. Φιλεταίρου 28.