Where did & come in the alphabet?

Last. Even if not really a letter, it used to be added on after Z. It used to be called “and per se and,” meaning ”‘and’, as such or by itself ‘and” (elided into “ampersand”) and was made of the letters “et”, which is Latin for “and.” You can still sort of see how & might look like a lowercase e + t.

More here.

Oh for goodness sake Jeruba, I’ll be checking to see if you just make that story up.

@Pinguidchance Jeruba never makes anything up; she knows everything or how to find out everything. Don’t mess with the Queen of Fluther Knowledge.

Is this a good time to ask what my dream meant?

The plus sign is also a variation on the same symbol. I learned this in a similar question I asked a few years back.