Orthographic borrowing from Sumerian 𒄑𒄿𒇻 (g̃eškun₄ /kug̃/, “stairs”).
𒄑𒄿𒇻 • (GIŠ.KUN₄)
𒄑𒄿𒇻 • (g̃eškug̃₄, g̃eškun₄ /kug̃/)