V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

FYI
       For Your Information (slang, Usenet, IRC)


The Free On-line Dictionary of Computing (30 December 2018):

For Your Information
FYI

   (FYI) A subseries of RFCs that are not technical standards
   or descriptions of protocols.  FYIs convey general
   information about topics related to TCP/IP or the
   Internet.

   See also STD.

   (1994-10-26)