A different type of ^ notation is sometimes used with

computers. Here the ^ means

control, as in the

control key. Thus

^D is a control-D,

^H is a control-H, etc.

Yet another ^ notation is used in the context of mathematics in computer programming languages.
Here, the ^ stands for simple exponentiation, i.e.,
2^8 is used to write 2^{8} or 256. Some languages use ** instead of ^. This notation is sometimes used for writing exponents in other contexts where superscripts are not possible, such as in node titles.