The popular word can be spelled just about any reasonable way and still be correct: O.K., OK, ok, okay. The term originated during an 1830s New England slang fad as the abbreviation of the purposeful misspelling oll korrect. While O.K. is the most historically accurate, it is also by far the least used and, by common usage, the least correct. Only The New Yorker, as usual, still considers O.K. the proper spelling, spurning even its own preferred dictionary. I suggest the most common spelling, okay, which follows standard capitalization and cannot be confused for an abbreviation.