'''"Ship classes"''' refers to the common practice of building multiple ships using a same or similar design. The design is then called a "class", and the class is often named after its 1st built or commissioned ship, or the initial design's code name. Ships built under the same class are then called "sister ships". | '''"Ship classes"''' refers to the common practice of building multiple ships using a same or similar design. The design is then called a "class", and the class is often named after its 1st built or commissioned ship, or the initial design's code name. Ships built under the same class are then called "sister ships". |