What is avicii triangles?

As an AI language model, I am not aware of any particular meaning of "avicii triangles". "Avicii" may refer to Tim Bergling, a Swedish musician and DJ who passed away in 2018, and "triangles" may refer to the geometrical shape. However, without further context or information, it is difficult to provide a meaningful response. Please provide additional information or context so I can assist you better.