# \rho

The ρ symbol (Greek small letter rho, U+03C1), written as \rho in LaTeX math mode.

https://texform.dev/latex/symbols/rho

## Metadata

| Field | Value |
| --- | --- |
| Topic | [Greek letters](https://texform.dev/latex/topics/greek) |
| Packages | base |
| Allowed mode | math |
| Glyph | ρ |
| Unicode | U+03C1 GREEK SMALL LETTER RHO |
| Delimiter | No |

## Syntax

```latex
\rho
```

Takes no arguments.

## Common tasks

### How to write a Greek rho

```latex
\rho
```

[Open in Playground](https://play.texform.dev/?input=%5Crho)

### How to write a density

```latex
\rho=\frac{m}{V}
```

[Open in Playground](https://play.texform.dev/?input=%5Crho%3D%5Cfrac%7Bm%7D%7BV%7D)

### How to write a correlation coefficient

```latex
\rho_{X,Y}=\frac{\mathrm{Cov}(X,Y)}{\sigma_X\sigma_Y}
```

[Open in Playground](https://play.texform.dev/?input=%5Crho_%7BX%2CY%7D%3D%5Cfrac%7B%5Cmathrm%7BCov%7D%28X%2CY%29%7D%7B%5Csigma_X%5Csigma_Y%7D)

## Usage frequency

6.30% of formulas in the measured corpus contain this entry, rank 15 of 474 entries with frequency data.

## In TeXForm

TeXForm parses this entry as a character leaf mapped to U+03C1 (GREEK SMALL LETTER RHO).