Ipponjime consists of three claps and one final clap as "Iyo'o (call), clap clap clap! Iyo'o, clap!" and this combination of "3" and "1" represents "Sangokuichi" (the word is used to mean "unparalleled in Japan, China and India" meaning unparallel in the world), metaphorical to the dream of Masamune who sought for ruling Japan.
「いよ～っ、パパパン！、いよ～っ、パン！」という「3」と「1」の拍子の組み合わせが「三国一」を表しており天下を狙った政宗の夢が込められている。