Letters typically refer to alphabets or individual characters of an alphabet. In the given context, "See 36-Across" suggests that the answer to the clue can be found in another part of the puzzle where 36-Across is located. Without the specific information about 36-Across, it is not possible to determine the meaning of "letters" in this particular instance.
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: See 36-Across. Explanations are generated by AI and may be inaccurate.