**

Symbol

 * 1)  Exponentiation.
 * 1)  Exponentiation.
 * 1)  Exponentiation.
 * 1)  Exponentiation.
 * 1)  Exponentiation.
 * 1)  Exponentiation.
 * 1)  Exponentiation.
 * 1)  Exponentiation.

Usage notes

 * Further asterisks may be added as required.