This is a pylon sign and it is located in Fairfax Station, right down the street from our Centreville Sign A Rama. These signs are typically seen in front of shopping centers and "strip malls".You can see that the pylon sign is basically a large directory for the various tenants. The sign has "slots" that hold the tenant's name on an insert. The inserts are usually made of acrylic and are covered with colored vinyl. They easily slide in and out of the side of the sign to accommodate new tenants.
These pylon signs are designed in all sizes, colors and shapes. They are obviously effective. That's why you see them everywhere!