Rho

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. In physics, the same letter is used to represent density.

 Related pages 
 Spearman's rank correlation coefficient, represented by ρ

 References 

Category:Greek alphabet