State of California used to allow 5 in healthcare reporting: male, female, indeterminate, unknown, and other.
The first two are largely self-explanatory, self-identification issues largely not considered. "Indeterminate" means that evidence is present but it's not possible to distinguish. "Unknown" means evidence isn't present (and hence it's not possible to make a determination. Example: unidentified human remains found and either grossly mutilated or partial to the point of not being able to determine sex. "Other" means that evidence is present, and it's possible to make a determination, but it doesn't fit any of the previous categories.
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