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I would like to know how to pronounce in english this symbol $\nabla \phi$ It is something phi ... ?

thank you

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2  
del phi? –  Daniel R May 12 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 at 11:56
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Thanks to @Daniel, now I know what to call oracles in the future! –  Hurkyl May 12 at 12:08
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Detexify can sometimes help with this kind of question: detexify.kirelabs.org/classify.html –  Phira May 12 at 12:30
    
@Phira What an awesome site! That should be stickied somewhere (and probably is already) –  Mathias711 May 12 at 12:39

1 Answer 1

The inversed delta is called Nabla. So Nabla phi. See also http://en.wikipedia.org/wiki/Nabla_symbol

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thank you very much :) –  OSryx May 12 at 11:52
    
Welcome, good question! –  Nicky Hekster May 12 at 11:53
    
Is it also called nabla when dealing with finite differences? I have always called it "nabla" in vector analysis, but I have a doubt for other uses. –  Jean-Claude Arbaut May 12 at 14:03

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