A slogan expressing an affinity for the impermutability of the truth. Used by objectivists and people of that ilk. A subjectivist might say "A is perceived to be A by me." Or maybe that's just reading too much into it.

In The Simpsons episode A Streetcar Named Marge, the subplot is Maggie's escape from the Ayn Rand Daycare Center for Tots. On the wall, where one might see a colorful pastel poster of letters of the alphabet, is a poster saying "A is A" in big block letters. The whole episode is sweet, but I'm still laughing at that sight gag.