# How do we pronounce this symbol: $\nabla \phi$

I would like to know how to pronounce in English this symbol: $\nabla \phi$.

It is something phi ... ?

• del phi? – Daniel R May 12 '14 at 11:51
• If you know the context, you can also say "grad phi" (if in the context of gradient), or it could be used in the context of curl or divergence. That's a more "informed" pronunciation that tells you more than just plain notation. – orion May 12 '14 at 11:56
• Thanks to @Daniel, now I know what to call oracles in the future! – Hurkyl May 12 '14 at 12:08
• Detexify can sometimes help with this kind of question: detexify.kirelabs.org/classify.html – Phira May 12 '14 at 12:30
• @Phira What an awesome site! That should be stickied somewhere (and probably is already) – Mathias711 May 12 '14 at 12:39