Carpenter squares are tools commonly used by carpenters for measuring and cutting precise angles. They are typically made of steel or aluminum and consist of two arms forming a right angle. There are several names for carpenter squares, including framing squares, rafter squares, and steel squares. Framing squares are commonly used for laying out and framing roofs, while rafter squares are used specifically for measuring and cutting rafters. Steel squares are typically made of hardened steel and are known for their durability and accuracy. No matter what they're called, carpenter squares are essential tools for any carpenter or DIY enthusiast who wants to achieve precise and accurate cuts and angles in their projects.