# numbers:About

### From numbers

Certain numbers are sufficiently distinctive that they convey a lot of information about the domain of conversation around where they occur in text or source code. For instance, <math>pi</math> and Planck's constant are individually recognizable, although in the case of Planck's constant some knowledge of Physics is required. A number may only become distinctive when combined with a set of other numbers, for instance there is nothing special about 0.5 until it is combined with half-a-dozen other numbers that are used to calculate sine/cosine using a Chebyshev series.

This Wiki is an attempt to collect together distinctive numbers.

Tools that use these distinctive numbers include:

* numbers which extracts floating-point literals from files and prints out those that match known distinctive values.