**INDEX (plural indices): **you can see these in expressions like $5^2 = 25$. The 5 is called the **BASE**, the 2 is called the **EXPONENT **or **INDEX**, and the 25 is called a power (in this case it’s a * power of 5*).

Barney Maunder-Taylor

**INDEX (plural indices): **you can see these in expressions like $5^2 = 25$. The 5 is called the **BASE**, the 2 is called the **EXPONENT **or **INDEX**, and the 25 is called a power (in this case it’s a * power of 5*).