骨スキ包丁 Boning Knife (Honesuki)
The Boning knife is specialized for the task of deboning meat (separating meat from the bone). In Japan, the triangular version is often called a Honesuki, and it is built to be robust enough for disassembly work.
肉から骨を削ぎ落とす「骨引き(解体)」作業に特化した包丁です。「ボーニングナイフ(Boning knife)」と呼ばれています。