Particle View > Click Shape in an event or add a Shape operator to the particle system and then select it.
Shape is the default operator for defining the geometry used in the particle system. You can use it to specify particles in the shape of pyramids, cubes, spheres, or vertices, as well as particle size.
Note: All primitive particles created with Shape have pivot points in their geometric centers.
Shape—Sets the shape of the particles to Vertex or one of three geometric primitives. Default=Pyramid.
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Vertex—Use this option to create non-rendering particles whose sole attribute is their location. This can be useful when using script operators.
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Tetra—These tetrahedron-shaped particles have a four triangular sides. Having only four polygons, the tetra is the simplest of the rendering particle shapes.
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Cube—These box-shaped particles have six square sides, all the same size.
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Sphere—Creates spherical particles. The sphere has the most polygons of the rendering particle shapes, and its orientation isn't obvious.
Size—Sets the overall size of the particles in system units. Default=10.0
Setting Size=0 makes the particles invisible.
Scale—Turn on to set the size of the particles as a percentage of the Size value. Use the numeric field to set the Scale percentage value. Default=100.
Scale is animatable, while Size is not. Also, turning on Scale creates the scale data that any Scale operators further on in the flow can work with.