also: かみこま
noun
The small bridge-like piece near the top of a shamisen neck that supports the second and third strings. A specialized term used in shamisen construction and playing.
三味線の上駒は、二の糸と三の糸を支える部品です。
The shamisen's kamigoma is the part that supports the second and third strings.
駒 is the general term for a bridge on string instruments. 上駒 specifically refers to the upper nut on a shamisen.
Compound of 上 (kami, 'upper') and 駒 (koma, 'bridge'). The reading かみごま reflects rendaku voicing of こま to ごま.