Z

In different contexts, the term "Z" can have various meanings: 1. In mathematics, it often represents a variable or the set of integers (denoted as Z). 2. In physics, it can symbolize atomic number. 3. In sleep studies, "Z" is often used to symbolize sleep. 4. In the military, "Z" time refers to Zulu Time, which is the same as Coordinated Universal Time (UTC). 5. In 3D geometry, "Z" can refer to the z-axis, representing depth in a three-dimensional coordinate system. 6. In the world of cars, "Z" can refer to a model or series, such as Nissan's Z series. 7. It is also the 26th and last letter of the English alphabet. Please provide more context if you're referring to a specific field or usage.