Terminology
Those systems that only look forward are FLIR, (obviously!). They are often fixed to the centreline of the aircraft, but there are others that mistakenly called a FLIR, when they are technically in the family of IRDS - (IR Detection Systems) that can be rotated around - 360 in most cases, and those that can look up and down, forward and back (including 90 down and 90 rear) - most targetting pods have this capacity and can sometimes be projected onto a HUD or similar.....IMHO the term FLIR is stuck in the '70s, but just like most 'punter oriented' terms, the wannabees can relate to what they already know (eg only bombers bomb, and fighters fight ....)...