VOR - VHF Omnidirectional Receiver. One of the more common navigational aids that the FAA has dropped all over the country (and sometimes the world). A VOR sends out a radio signal that is slightly different in each direction (the difference is phase, if you want to get technical). So, an airplane's VOR tool listens to the VOR, and by measuring the difference in the radio, it can tell which direction it is from the VOR. Since your chart will show where the VOR is, and you now know where you are in relation to the VOR, it has helped you figure out where in the local area you might happen to be.
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