# Trying to make a water droplet, rotate line into 3d object

I'm trying to make a 3d stl of a water droplet (for a 3d printer). Essentially what I was thinking was to draw out a line like so

\
\
|
/


And then rotate it around the z axis to make a 3d shape. First, I can't seem to figure out how to do this, second, is that the best way to accomplish this task?