The caxirola () is a Brazilian percussion instrument created by Carlinhos Brown and consisting of a closed plastic basket with a flat-bottom filled with small synthetic particles, in an attempt to create a sustainable product. It was based on the caxixi, and thus it is also an indirectly struck idiophone, sounded by shaking. The caxirola was certified on September 27, 2012, by the Brazilian Ministry of Sports and was created to be the official musical instrument of the 2014 FIFA World Cup in Brazil. However, it was not allowed inside stadiums of both the World Cup and the 2013 FIFA Confederati
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The caxirola () is a Brazilian percussion instrument created by Carlinhos Brown and consisting of a closed plastic basket with a flat-bottom filled with small synthetic particles, in an attempt to create a sustainable product. It was based on the caxixi, and thus it is also an indirectly struck idiophone, sounded by shaking. The caxirola was certified on September 27, 2012, by the Brazilian Ministry of Sports and was created to be the official musical instrument of the 2014 FIFA World Cup in Brazil. However, it was not allowed inside stadiums of both the World Cup and the 2013 FIFA Confederations Cup as the government considered it a security risk.
== Background and concept == Carlinhos Brown has expressed concern about the potential unpleasing sound of the official instrument of the Cup, as it happened with the vuvuzelas of the previous tournament. According to him, "the caxirola respects the sound limits. It reproduces sounds of nature, of the sea, because of that, we worked with the best acoustic engineers so that the sound was nice, pleasant." "Researchers at Brazil's Federal University of Santa Maria determined .. that it would take 30,000 caxirolas to produce the same sound pressure level as a single vuvuzela."
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).