34 CFR § 300.32 - Personally identifiable.
Personally identifiable means information that contains -
(a) The name of the child, the child's parent, or other family member;
(b) The address of the child;
(c) A personal identifier, such as the child's social security number or student number; or
(d) A list of personal characteristics or other information that would make it possible to identify the child with reasonable certainty.