# How do I read out $\frac{∂}{∂x}$?

$$\frac{d}{dx}$$ as "d by d x".

$$\frac{∂}{∂x}$$ then?

The symbol is referred to as "del" (not to be confused with ∇, also known as "del"), "dee", "partial dee", "partial" (especially in LaTeX), "round d", "curly dee", or "dabba".

So according to this, I should read it out as "del by del x". Is that correct? If not, how else?

• IMO, $\nabla$ is better known as nabla (LaTeX \nabla).
– user65203
Jun 14, 2017 at 14:06
• Using "dee dee x" works for me. It's often clear from the context whether to interpret "dee" as $d$ or $\partial$. If not, I say "partial dee dee x". Jun 14, 2017 at 14:08
• Jun 14, 2017 at 14:09
• I say (I say, I say) "Partial dee by dee ecks"
– user284001
Jun 14, 2017 at 14:53
• I have edited my answer... check it out... Sep 6, 2017 at 18:35

You can say $\displaystyle\frac{\partial y}{\partial x}$ as "Partial derivative of y wrt. x" or "del y by del x".
You can also read this introductory text on partial derivatives. • Similarly, I would read $d\over dx$ as "derivative with respect to $x$"