Pennants are triangular flags that are often made of felt. They may or may not come attached to a pole, which will allow you to hold the pennant at games. If the pennants are not attached to a pole, they can be easily attached to a wall with thumb tacks or nails to help display college pride. Pennants typically have either the name of the college or the college's easily identifiable logo.
Lawn flags are typically made of nylon or polyester and look and feel like a "regular" flag. They are often rectangular in shape and have stands that easily allow them to stick in the ground so that they will stay without being blown down by a strong gust of wind. These lawn flags allow you to display your allegiance on your sleeve so that your neighbors will know exactly which team you support.
"Regular" flags are made of polyester or nylon and are very similar to the types of flags you would place in front of your house to display your allegiance to a certain country. These flags may be placed in a flag holder in front of your home and often come with holes or a sleeve to place a pole inside of. You can also place the flag on the wall with tacks or nails.
Flags for your car are miniature versions of the "regular" flags that come with a plastic holder attached. The plastic holder allows you to simply and easily attach it to the top of your car so that your college flag can fly in the wind, showing everyone who drives past what college you attended or root for during championship games. These flags are often made of nylon or polyester, just like their larger counterparts.