Historical clue formulations

• Letters used in the absence of a letter — 2022-12-24
• Abbr. for someone with just a first and last name — 2018-08-21
• Name placeholder in govt. records — 2011-10-26
• Application letters — 2011-01-06
• It indicates a void in some govt. records — 2010-08-17
• Application letters — 2008-04-20
• Application form abbr. — 2006-09-24