Which item of swimwear is named after an atoll in the Pacific Ocean?

French automotive engineer and clothing designer Louis Reard introduced a swimsuit design he named the "bikini", adopting the name from the Bikini Atoll in the Pacific Ocean. It was the colonial name the Germans gave to the atoll, transliterated from the Marshallese name for the island, Pikinni.

Bikini typically describes a women's simple two-piece swimsuit featuring two triangles of fabric on top and two triangles of fabric on the bottom. Due to its controversial and revealing design, the bikini was accepted very slowly by the public. It gained increased exposure and acceptance as film stars like Brigitte Bardot, Raquel Welch, and Ursula Andress wore them and were photographed on public beaches and seen in film. In many countries the design was banned from beaches and other public places.

The minimalist bikini design became common in most Western countries by the mid-1960s as both swimwear and underwear. By the late 20th century it was widely used as sportswear in beach volleyball and bodybuilding.