This is a red hair emoji, which is specially used to assist and decorate other expressions (some human figures and body expressions in the "human & body" category). It is generally not used as an independent expression, and sometimes refers to hair or It can be used alone for red hair.The above content is more difficult to understand.
Here is an example: How did
👨🦰 come about? In unicode encoding, it is actually 👨 + 🦰 =
👨🦰