2 to the second power, written 2 with a superscript, (raised half a line to the right of the numeral 2).
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Ideally using a superscript 4 to the right of the thing being raised to the power of 4. Computer languages can use: 1) a double multiplication sign - a double asterisk, eg 2**4 is 2 to the power 4, which is 16; or 2) the caret symbol, eg 2^4 is 2 to the power 4. The latter (using the caret symbol) is often used when a superscript is impossible, outside computer languages.
2 to the power of 8.
Example: 1/2
a2
2^20