What's the proper way to draw the "and" sign?

I’m talking about the one that has the wavy squiggle and then the line or the dots. Some people draw a 3 and then put two dots above and below it, others put a slash through it. Yet others like I draw a backwards 3 (cursive E I guess) and then slash it (or double-dot it). And then there are some other more deviant variations of this symbol.
What is this thing called and what is its origin?