This is a folding hand fan, shaped like a sector of a circle, and there is a thin material mounted on slats that revolve around a pivot so that it can be closed when not in use. Some platforms have patterns painted on the hand fan surface. It is a new emoji that belongs to Emoji 15.0 released in September 2022.
🪭 generally means hand fan, or anything that has the similar shape. Since a hand fan has both cooling and decorative purpose, this emoji can also be used to indicate the weather is too hot, or used in topics that related to hand fans, such as fan dance. The hand fans are mostly used in ancient times, they can represent retro too. Related emojis:
🌬☀🍃🏛🪈