The Heckelphone is a musical instrument that originated in Germany and is part of the oboe family. This unique instrument is similar to the oboe but produces a deeper sound due to its larger size and lower pitch. There are relatively few synonyms for the Heckelphone due to its rarity, but some possible options include bass oboe, baritone oboe, and contra-octave oboe. Other terms that may be used to describe it include the Heckelfoon, Heckelphon, and hecklephone. Despite its obscurity, the Heckelphone has been featured in various orchestral pieces and is a beautiful addition to any musical arrangement.