Considering that this is coming from the same drug culture that uses the word "molly" refer to "some mixture of empatheogenic drugs and possibly some amphetamine", expecting specificity from your terminology is a bit unrealistic.

I'm not (just) being judgmental here: volunteering harm reduction at festivals, the number 1 problem we had was that users had no idea what they had put into their bodies.

Actual chemists, no doubt, don't use any of this terminology since chemical reactions don't produce the desired results if you're vague about what you put into them.

ET = ergotamine tartarate, the typical salt

It's been a while since I've done chemistry- does typical mean something in the context of chemistry?

If someone asked me what the typical salt was I'd say table salt

The way I learned it, if you mix an acid and a base, you get a salt and water. Table salt (NaCl) is the result of mixing hydrochloric acid (HCl) and sodium hydroxide (NaOH):

HCl + NaOH -> HOH (water) + NaCl

But if you mix a different acid and a different base, you'll get a different salt, for example if you mix sulphuric acid and calcium hydroxide, you get calcium sulfate:

H2SO4 + Ca(OH)2 -> 2(HOH) + CaSO4

Calcium sulfate is just a different salt.

Organic chemicals are often “salted” to cause them to precipitate out of the solution they’re synthesized in. It’s a salt in the chemical sense, but not in the culinary sense.

Typical cause that's the end result of most commonly used mass synthesis

Lsd is also exclusively sold as tartrate