Question

what is turned down delta symbol for?

Answer 1

is it Laplacian operator?

Answer 2

@asnaseer help please

Answer 3

here is a good site that lists all the mathematical symbols: http://en.wikipedia.org/wiki/List_of_mathematical_symbols

Answer 4

i tried but can't find :(

Answer 5

can you please draw the symbol you are talking about?

Answer 6

got it thanks

Answer 7

:)

Answer 8

If the upside down triangle, then it is differential operator..