What does a o with a line through it mean?

If you need more help can you give me the latex code for it and i can do a question with it contained thanks.

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- January 12th 2010, 11:46 AMadam_leedsSymbol help
What does a o with a line through it mean?

If you need more help can you give me the latex code for it and i can do a question with it contained thanks. - January 12th 2010, 12:00 PMMoo
Hello,

? That's a greek letter, called "theta"

Or ? That's the empty set.

But since you put this in calculus, it's more likely the greek letter - January 12th 2010, 12:07 PMadam_leeds
- January 12th 2010, 12:55 PMDrexel28
- January 12th 2010, 01:03 PMadam_leeds
- January 12th 2010, 01:13 PMMoo
Greek letter "phi"

Hadn't thought of this one (Thinking)

Here, it denotes a function/mapping.

is the gradient.