Easy way:
Make the "point" a very small profile, such as a 1mm square, which will be smaller than can actually be built. Will be a solid.
Harder way:
make individual faces built of profiles of the "sides" of the object. Won't be a solid.
More involved:
make a solid, then carve away with voids to form the "pointed" object.
Actually, Revit can go as far as 0.2 millimeters of distance between 2 or more points, to have a mass or surface end at "a point". For further reading about this, please refer to this thread in Revitforum: