body identity

A body identity is any unambiguous and unique identifier that makes it possible to identify a human body, alive or dead. This includes:

To reveal someone's body identity involuntarily (called "outing" in the gay and lesbian community) will very often subject them to risk.

It is extremely rude. Depending on context, it may be a violent act, for instance, if it brings them to the attention of irresponsible or stupid authorities (see "no-fly list" for instance).