The Jargon File (version 4.4.7, 29 Dec 2003):

splash screen
 n.

    [Mac users] Syn. banner, sense 3.


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

splash screen

    An initial screen displayed by interactive
   software, usually containing a logo, version information,
   author credits and/or a copyright notice.

   The term originated among Macintosh users and spread, the
   synonym banner was once also used.

   [Jargon File]

   (1998-04-28)