This is a pale white square, it represents this skin color or this color, it is specially used to assist and decorate other emojis (partial human and body emojis in the "Human & Body" category), it is generally not used as an independent emojis. But sometimes it can be used alone when referring purely to colors. The above content is difficult to understand, here is an example,"
🧑🏻 How did it come about? In unicode encoding, it is actually 🧑 + 🏻 =
🧑🏻"