Long Bones: larger than they are wide, i.e. arms, legs, phalanges, etc.
Short Bones: square or cube shaped, i.e. wrist, ankle, patella, etc.
Flat Bones: flat, thin bones, often curved, i.e. skull plates, ribs, sternum, etc.
Irregular Bones: odd, irregular shapes, i.e. pelvis, vertebrae, scapula, etc.