From Simple English Wikipedia, the free encyclopedia
Rho
(uppercase/lowercase
Ρ ρ
) is the 17th letter of the
Greek alphabet
. It is used to represent the "r" sound in
Ancient
and
Modern
Greek. In the system of
Greek numerals
, it has a value of 100. Letters that came from it include the Roman
R
and Cyrillic
Р
.
In
statistics
, the lowercase Rho ("ρ") is used to represent population
correlation
.
[1]
In
physics
, the same letter is used to represent
density
.
[2]