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Individual loops are the loops, performed by each of the 4 aircrafts separately..
In Russia it is called the loop of Nesterov. Pyotr Nesterov is a famous Russian pilot who is considered to be the founder of aerobatics. It was Nesterov who performed the so-called “dead loop” for the first time; in fact this extremely difficult maneuver is more often referred to as “Nesterov’s loop.”
Nesterov believed an aircraft could fly a loop, a feat not previously performed. Despite the doubts of his peers, Nesterov proved his theory on 9 September 1913 (27 August by the calendar then used in Russia) and became the first pilot to fly a loop.