An FD-292 form is used by FBI agents to notify the agency that they are getting married or divorced.
It consists of information taken from the subject, rather than details about the subject themselves.
A forms list from an internal FBI Website lists the FD-302 as Form for Reporting Information That May Become Testimony.
Standard "Advice of Rights" and waiver form.
An FD-772 form is used by FBI agents to account for the purposes and events of any trips they have taken outside the country, whether business or pleasure.
An FD-888 form is used by FBI agents to prepare for a Federal arrest.
An FD-920 form is used by FBI agents to initiate an investigation of suspected drug crimes.