In mathematics, the symbol "ø" with a line through it is used to represent the empty set, which is a set with no elements. It is not used to represent the letter "o" or the number zero. The symbol is commonly used in set theory and mathematical logic to denote a unique set with no elements.
Typically, with hand written documents, the number zero will be indicated as a circle with a slash through it.
The line going through an "o" helps to clarify the letter o, from the number zero.
It's called theta and it's a Greek letter.
Izzy and Amie made the zero with a line through it!
In computer technology, a circle with a line through it typically denotes a zero, as opposed to the letter 'O'. This is done to prevent confusion. Not sure if this is what you where looking for
by zero line do you mean 0? or do you mean 0 with the slash in it like this /?
Abbreviation for Diameter(as used in Technical drawings).
It is used to differentiate the number zero from the letter O in alpha numeric strings.
I and A!
it means zero or close-ist to zero
Usually the Greek letter theta is used. It looks like a 0 (zero) with a horizontal line through it.
If you mean a zero with a diagonal line through it, it is the symbol for the empty set which is the set that contains nothing.