Rho Symbol
About Rho Symbol
ρ is the Rho Symbol, the lowercase form of the 17th letter of the Greek alphabet (Ρ / ρ). The Rho Symbol ρ is among the most common Greek letters in scientific and technical literature, frequently used for It denotes density, resistivity, and correlation coefficients—common in physics and statistics.
【Pronunciation】 In English, ρ is most often pronounced ROH or ROO (IPA: /roʊ, ruː/). This is simply the anglicized name of the Greek letter.
The lowercase Rho Symbol ρ is written as a distinct Greek glyph and is assigned codepoint U+03C1 in the Greek and Coptic Unicode block. In plain or sans-serif fonts it can be mistaken for the Latin letter p, so verify the typeface or context.
【Historical Origin】 Rho derives from the Phoenician letter res and is a standard notation in fluid and electrical science.
【Common Uses】 ρ is highly active across disciplines: It denotes density, resistivity, and correlation coefficients—common in physics and statistics. It often appears alongside the uppercase Sigma Σ and lowercase Sigma σ in formulas, papers, and engineering drawings.
How to Type Rho Symbol
Windows Input
Method 1: Hold Alt and type 961 on the numeric keypad, then release Alt to get ρ.
Mac Input
Method 2: Press Control + Command + Space to open the Character Viewer, search for 'greek' or 'Rho Symbol', then select ρ.
HTML/CSS Input
Method 3: HTML: ρ or ρ or ρ; CSS: content: "\03C1";
LaTeX Input
Method 4: Use the \rho command in LaTeX math mode to produce ρ.
Rho Symbol FAQ
How is ρ pronounced?
The English pronunciation of ρ is ROH or ROO (IPA: /roʊ, ruː/). It is the anglicized name of the Greek letter, used directly rather than described as 'lowercase ρ'.
What is the difference between ρ and the Latin letter p?
ρ (U+03C1) is a Greek lowercase letter, whereas p is a Latin letter; their codepoints and glyphs differ. In a proper typeface ρ and p are clearly distinct, but in plain text or sans-serif fonts they can be confused, so rely on context.
How do I type ρ in Word, web pages, and LaTeX?
On Windows use Alt+961 on the numeric keypad; on Mac open the Character Viewer and search 'greek' or 'Rho Symbol'; on the web use the HTML entity ρ; in LaTeX use \rho. For bulk use, copy ρ directly from this page.