This is the emoji of a women detective, who wears a gray hat. Her clothes are well-ironed, and the collar is standing up to cover the half-face. On some platforms, it also has a magnifying glass in her hand, looks mysterious and capable.
🕵♀ usually used to represent the detective, or the things suspense, reasoning, and so on. Genderless version🕵, male version
🕵️♂️. Related emojis:
🧐👮💡🔍