http://www.roblox.com/User.aspx?ID=5924271
Bevels are the rounded off corners of your avatar's limbs/torso when you wear the 1.0 body.
As you can see in this one, his arms and torso appear have sharp edges, while his legs are rounded off.
While it is not uncommon to find old users with no bevels, I have never seen a user with a mixture of both.
Ok, to make it easier, go to Google. Then search up the word "Robloxians" and go to the first one. Somewhere around that page, you will find what you were talking about.