The term 'BRIDGE LIMIT UNIT' is composed of three words, each with three letters. The first word, 'TON', is a UNIT of measurement for weight and volume. It is equal to 2, 000 pounds or 907 kilograms. The second word, 'LIMIT', refers to a restriction or boundary. The third word, 'UNIT', is a single thing or entity that is part of a larger group or system. Together, these three words form the term 'BRIDGE LIMIT UNIT', which is a device used to measure the load capacity of a bridge. This device is used to ensure that the bridge can safely support the weight of vehicles and other loads that cross it.