ἀγεωμέτρητος μηδεὶς εἰσίτω → no one ignorant of geometry may enter, let no one ignorant of geometry enter, let no one ignorant of geometry come in
rudder: P. and V. πηδάλιον, τό, or pl., V. οἴαξ, ὁ (also Plato but rare P.), πλῆκτρα, τά (Sophocles, Fragment).