To start with, I have no idea where I should be posting this. Mathematics seemed the most applicable. Any help in a better category would be appreciated.

Anyway, I remember hearing awhile ago about a method that could determine if a set of noises, symbols, or something of the sort comprised a language. By counting the number of times and vocalization or somesuch appeared in a given time, and then graphing the frequency of each item, you could tell if you had a language or not. Each item was one dot on the X axis, and the frequency of its use was on the Y axis. If what before was truly a language, the graph would make a right triangle.

I can't quite remember where I heard this from, or what it is called. Does anyone have any ideas?