kontrabassolle
Kontrabassolle is a term sometimes used colloquially to refer to a very large double bass. While there is no official classification for a double bass of this size, it generally implies an instrument significantly larger than the standard 3/4 or 4/4 size. Such instruments may be custom-made or modified from existing basses to achieve a deeper resonance and a more imposing physical presence. The term itself is a portmanteau of "kontrabass" (the German word for double bass) and "olle" (a slang term for something large or impressive).
Playing a kontrabassolle can present unique challenges and advantages. The larger size can make it more difficult