Active 3 years 2 months ago. Is the ratio between the circumference and diameter of a circle. For example a calculator would show the number 25 trillion as either 25E13 or 25e13.
It has several meanings in mathematics.
In mathematics and statistics many symbols are used to denote different things eg. The symbols are shorthand and are much more efficient than writing out the words or meanings. What does the Greek E-like symbol mean. It is not a mathematical symbol.