The term 'PART OF A FINGERBOARD' can be summarized by the solution 'FRET', which is a four-letter word. A FRET is a raised bar or strip of metal on the fingerboard of a stringed instrument, such as a guitar or violin, that divides the fingerboard into segments and helps the player to produce different notes. The frets are usually made of metal, but can also be made of wood, plastic, or other materials.