The lame verbal wit does not work if the weapons are described by their Chinese name of ‘gen‘.

In martial arts a weapon with a handle which has a round (circular) cross-section generally can be grabbed and used effectively no matter what the rotation. So one could use a short stick (jo in Japanese; zhang and a lot of other names in Chinese) or a staff without much concern. Most swords have a handle, grip or other names that should tell you what axis the edges of the blades are on. If you are using a foil, there’s no need as there is no edge (just a point), but the rest of the time you as the fencer fighting for your life need to know that you will slash and won’t deliver a flat hit. We usually tell students “IF you survive the first flat hit  …” The tactical need to know where the (only) business edge of the saber is is even greater. So I would assert that having a circular handle on a sai is likely an error. Your hand and brain need to know that the axis of the three tines of the sai is parallel to the line of your hips (so opponent sees a ‘W’). If the axis of the sai’s points is perpendicular to the line of your hips the opponent sees an ‘I’ and I’d not fancy your chances. And if you spin the sai to reverse the grip to set up for a pommel strike …