Its short for polygon, which is basically what makes 3d modelling possible, imagine it as the "pixels" that the computer makes it show up in the screen, what hes making is an simulation of a low polygon models, but it isn't part saving, much the opposite, im pretty sure you wont even read this anyway so i hope you have a good day i guess idunno
Actually this is pretty badly explained and some parts are incorrect let me say it correctly.(I think)@@randomchannel-kh7oc Basicly when you render something like Mario 64 everything is made of triangles. And every part where the triangles meet is called a polygon. Polygons and triangles is what makes everything! Even Roblox. Edit: forgot to mention that there's low poly which is when there are a little bit of triangles meeting only which means that it's less detailed and high poly that's extremely detailed and the triangles are unnoticeable