It is generally a number.
I have been researching about this topic, I think I have the idea but I also think it's wrong.
Traders can use any slang or description they like to describe their actions.
It's too much for indoors and not enough at distance.
I was in a similar boat and actually went for the 1-6x--you get a little more magnification on the long shots and can go to 1x for short distance.
Might replace my 1-6's with 1-8's.