what do you call a person who does acrobatics
Aerial silk The fabrics used as silks are very strong with some give and flexibility. The fabric is 2-way stretch polyester lycra or Tricot Nylon. The width varies depending on the routine and the acrobat. The fabric is usually quite long, as it is doubled for rigging, giving the acrobat two strips of fabric to work with as they perform.[citation needed]
United States Air Force Pararescue The term "Para Jumper" is a retronym of the initials "PJ" which represent the Military Duty Identifiers; P =Parachutist and J= Diver, that were used on an Air Force Form 5 (Aircrew Flight Log) to identify anyone who is on board in order to jump from the aircraft. Pararescuemen originally had no "in flight" duties and were listed only as "PJ" on the Form 5. The pararescue position eventually grew to include duties as an aerial gunner and scanner on rotary wing aircraft, a duty now performed by aerial gunners. Currently, aircrew qualified Pararescuemen are recorded using aircrew position identifier "J" ("Pararescue Member") on the AFTO form 781.[13]