Number!
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A number (such as 1, 2, or 3) used in counting to indicate quantity but not order.
Uppercase and lowercase delta are used in different contexts. For example, the uppercase delta, which looks like a triangle, is often used to indicate a difference in some quantity (for example, when a quantity increases or decreases over time). More details here: http://en.wikipedia.org/wiki/Delta_(letter)#Math_and_science
Math used to be called Arithmetic.
math can be used in almost everything!how is it used graph's for the weather
Math class.