A saw was a tool with a serrated edge to cut through softer materials.
In 2370, after her encounter with a Bajoran Orb, Major Kira Nerys told Vedek Bareil Antos that all she saw was "lots of hammers, nails, and saws, surrounded by lots of Vedeks," when in actual fact her vision was much different. (DS9: "The Circle")
When constructing his replica of a Bajoran lightship in 2371, Benjamin Sisko wanted to use a sabre saw in the name of authenticity, despite the fact that a laser cutter would be more efficient. (DS9: "Explorers")