FAO (sometimes F.A.O.) is the acronym of For the Attention Of.
Use of the FAO in practice: The acronym FAO is used in business correspondence to refer to the addressee, i.e. the person to whom the letter is addressed. So we denote a particular person to whom letter is written. For e-mails, this abbreviation is not used as much as the addressee is intended by the field “To:”.
Example: FAO: John Doe.