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Triangle (officially published and stylized as the symbol ⊿, pronounced Triangle) is the title of the second original studio album (third overall) of Japanese girl group Perfume. Triangle was officially announced at Perfume's Disco!Disco!Disco! concert, and was released on July 8, 2009. Triangle was released seven weeks after Yasutaka Nakata's effort with Meg, "Beautiful." Despite selling lower than their first original album, "Game", Triangle was certified platinum by RIAJ for selling over 250,000 copies. The first track, "Take off" is a less than one minute instrumental. It plays the role as the introduction of the whole album and leads to the second song, "love the world, the seventh major single. "Dream Fighter" is the eighth major single. The next song "edge (⊿-mix)" is the b-side song from the single "love the world". This mix is over eight minutes and a little longer than the extended mix in the single. "NIGHT FLIGHT" is an 80's technopop-like song, which features a chopper bass. It was used in ads for Morinaga Milk's Pino Airlines campaign. Like the concept of the ads, the lyrics compare love with airplane flying. "Kiss and Music" is an R&B and hip hop influenced song.