No, keycaps are not universal. Keycaps are designed to fit specific types of keyboards, so it's important to be aware of the type of keyboard you have before selecting a set of keycaps. To find the right keycaps, you should first determine the type of keyboard you have, and then search for keycaps that are compatible with that type. Additionally, you should consider the size of your keyboard and the type of keys you are looking for when selecting a set of keycaps.
