# ∂

(Redirected from Rounded d)

The character (HTML element: &#8706; or &part;, Unicode: U+2202) or ${\displaystyle \partial }$ is a stylized d mainly used as a mathematical symbol to denote a partial derivative such as ${\displaystyle {\frac {\partial z}{\partial x}}}$ (read as "the partial derivative of z with respect to x").[1]

## Overview

The symbol was originally introduced by Adrien-Marie Legendre in 1786, but gained popularity when it was used by Carl Gustav Jacob Jacobi in 1841.[2][3][4]

is also used to denote the following:

The symbol is referred to as "del"[5] (not to be confused with , also known as "del"), "dee",[6] "partial dee",[7] "partial" (especially in LaTeX), "round d",[8] "curly dee",[9] or "dabba".[10]

The lowercase Cyrillic De looks similar when italicized.