F-4F ICE  s/n 38+53
Luftwaffe, May 1996

Intake with 'boundary layer diverter' or 'external diffusor ramp' or 'splitter plate'...
...however you name it, it's there to
a) keep the boundary layer of the nose away from the intake,
b) induce and control a shock pattern for external compression beyond Mach 1.
Note tiny perforation where boundary layer induced by the diverter itself is sucked away.

Photo by Burkhard Domke