This question already has an answer here:
I would like a trident symbol but there none to be found. The closest symbol I know is
using the wasysym package. But it is not very nice (too 'ornamental' to my taste). Do you know some alternatives (something like the math mode version of \neptune, see http://milde.users.sourceforge.net/LUCR/Math/mathpackages/wasysym-symbols.pdf) but without the circle it sits on?
EDT: The package mathabx has \Neptune too but it is even uglier IMHO