Do you want a straight answer or a philosophical one?
0 is what is left if you have neither done well nor badly.
You should aim to leave more than 0 if you can. Leaving nothing isn't too bad, but leaving bad things is worse.
You should always leave some warmth in someone's heart - and this can often be a lot easier than you may at first think.
the 'i' is the symbol for 'on' because it isn't an i its a'1' which looks like an i and the o is a 0
0 is a symbol for the absence of a number.
The symbol is typically written N but it's actually with a double diagonal line ℕ. It includes 1,2,3,4,5,6 etc (not 0). Z+ means the same.
A commonly used abbreviation is: 0 < x < 1 That means that "x" can be between these values. This is actually a shortcut for the combination: 0 < x AND x < 1. If you want to include the extremes, 0 and 1, replace the less-than symbol with the less-than-or-equal-to symbol.
It means against, or not
The symbol that means 'registered' is a ®.
This is the symbol &. It means and.
No because the 0 symbol originated from the Indian subcontinent but he may have improved on the usefulness of the zero symbol.
The asterisk symbol means 0 to many repetitions of the expression it follows. This means the regular expression "do*g" would match "dg", "dog", "doog", "dooog", ... or "(?>do)*g" would match "g", "dog", "dodog", "dododog", ...
Depending upon which symbol you mean, it usually means that symbol DOUBLED.
Horizontal line
There is no symbol above the number 0 on my phone keyboards. So clearly, it is not a standard.