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 28 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.