Lbf, or pound-force, is a unit of force commonly used in physics and engineering. Its synonyms include pound-feet, poundals, and kiloponds. Pound-feet is a unit of torque, while poundals measure force in the English engineering system. Kiloponds, on the other hand, is a unit of force used in the International System of Units (SI). Another synonym for lbf is newton, which is the SI unit of force. While lbf is commonly used in the United States, other countries use newtons or kiloponds to measure force. Using the correct synonym for lbf is important for conveying accurate information in these fields.