The term 'Mandolin Ridge' is a combination of two words, 'mandolin' and 'FRET'. The mandolin is a stringed instrument that is similar to a guitar, but with a much smaller body and a higher pitch. The FRET is the raised metal bar on the neck of the instrument that divides the strings into different notes. Together, these two words form the name of a ridge in the Appalachian Mountains of the United States.