Sorry. I should have been more precise with technical matters.
Lots of guys think they have generic "Gaydar" but "Gaydar One" (note the capital letters) is a specialized treatment that you go to a gay doctor for and he inserts a chip in you. It's not foolproof, but it increases the likelihood that you can spot an actual gay dude... IF he's the "One" for you. (Hence, the name: Gaydar One).
"Iota" is the ninth iteration of this still controversial treatment, as Iota is the ninth letter of the Greek alphabet. Each iteration becomes increasingly accurate.
Despite all this "science," I remain skeptical about its accuracy and that's why I wrote "I don't believe in Gaydar One Iota."
Hope that clears things up!