Here's what that means:

* 8.2-meter: Refers to the diameter of the primary mirror, which is the main light-collecting element of the telescope. This makes it a large telescope, capable of gathering a lot of light.

* Optical-infrared: Indicates that it can observe both visible light (the kind we see with our eyes) and infrared light, which is invisible to humans but carries valuable information about celestial objects.

* Reflecting: Means the telescope uses mirrors to focus light, rather than lenses.

The Subaru telescope is renowned for its advanced optics and instrumentation, making it a powerful tool for astronomical research. It is located atop Mauna Kea, a dormant volcano in Hawaii, which provides exceptional observing conditions with its high altitude and clear skies.