Philadelphia pattern is a type of hammer that has a flat striking surface on one end and a round, tapered end on the other. This tool is used for various purposes such as metalworking, carpentry, and blacksmithing. There are many synonyms for this type of hammer, including framing hammer, claw hammer, and rip hammer. Framing hammer is a type of hammer used mainly for framing and heavy construction work. Claw hammer is a type of hammer that has a curved claw for removing nails and other fasteners. Rip hammer is used for cutting and ripping materials such as wood. Overall, these hammers are essential tools for any DIY enthusiast or professional tradesman.