Heliostat is a term used to describe a device that employs mirrors or lenses to reflect sunlight in a fixed direction. However, there are a few other synonymous terms used to describe this kind of device, such as solar tracker, sun tracker, solar mirror, sunlight reflector, and sun pointer. These terms all describe a device that can reflect and concentrate sunlight onto a fixed spot. The different names for Heliostat reflect the diversity of the applications in which the device is used. Solar tracker is a common term used in the solar energy industry, while sun pointer is more commonly used in scientific research and experimentation. Overall, Heliostat, like many terms in engineering and technology, has several alternative names which can be used interchangeably depending on context.