"Half size" refers to a measurement that is exactly half of a standard size. This term is often used in various contexts, such as clothing, packaging, or even furniture. For example, a half-size shirt would be designed for individuals who require a smaller fit than the standard sizes available. In the world of music, "half size" can also describe instruments, like a half-size violin, which is smaller than a full-sized version. These instruments are typically made for younger or smaller players, allowing them to learn and play more comfortably.