3 (4)rar -

It is occasionally used in flight simulator forums (like Falcon BMS) to refer to specific low-poly model packs . 5th/7th Battalion, The Royal Australian Regiment - Facebook

Sometimes people use this shorthand for specific compressed file parts (like part3.rar in a 4-part set). 3 (4)rar

Lest we forget the sacrifices and the service of all who have worn the RAR patch. It is occasionally used in flight simulator forums