TAPR is the initialism for Tucson Amateur Packet Radio, the ham radio organization that has been at the on the cutting edge of digital radio technology for over 30 years.
I have been a member of TAPR for almost as long as it has been in existence. Presently, I am on its board of directors, serve as its secretary and edit its quarterly newsletter, PSR.
Every year, I staff TAPR's booth at the Hamvention in Dayton, Ohio. And invariably, every year a handful of attendees will come up to our booth and ask, "How are things in Tucson?" or something similar indicating that they believe that TAPR is a ham radio group out of Tucson, Arizona.
In truth, TAPR is related to Tucson in name only. The organization was founded there, but is not headquartered there. TAPR's mailing address used to be a post office box in Tucson, but that has not been the case for awhile.
None of TAPR officers or directors live in Tucson and although TAPR does have members who reside in Tucson, the majority of TAPR's membership are scattered all over the world.
And by the way, TAPR is no longer involved in "amateur packet radio," and has expanded its horizons to become a “community that provides leadership and resources to radio amateurs for the purpose of advancing the radio art.”