The "(U) b♡" or "Pretty In Love Face" emote is a commonly used symbol in online communication that represents a cute face with blushing cheeks and a heart-shaped mouth. The "U" in the emote stands for "you," while the "b" represents the lips forming a heart shape, and the "♡" is a heart symbol. It is often used to express affection, love, or admiration towards someone or something.