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
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DElta means "Change" delta can be represented by a triangle
a sign
= is the equals sign + is the plus sign * is the multiplication sign / is the divide sign - is the minus sign
This is greater > then this