Love can have multiple meanings depending on the context. However, in this particular instance, the word "love" is being referred to as a common sign-off in a letter. In this case, "love" is often used to express deep affection or warm feelings towards the recipient of the letter.
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: Emotion indicated by the emoticon <3. Explanations are generated by AI and may be inaccurate.