Helio

Helio is a term used in several unrelated contexts, generally derived from the Greek word helios, meaning sun. As a prefix, helio- denotes solar or sun-related phenomena in science and everyday language, as in helioseismology, helio- geography, and heliotherapy. The related variant heli- appears in many words such as heliocentric and heliophile.

In mythology and culture, Helios is the personification of the sun in ancient Greek religion, often depicted driving a sun-chariot across the sky. In contemporary use, Helio is also a given name in Portuguese- and Italian-speaking communities. A notable bearer is Helio Castroneves, a Brazilian racing driver and multiple Indianapolis 500 winner.

In science and technology, helio- forms are common in astronomy and physics, including heliometer (a device for measuring angular diameters) and heliocentric models of the solar system. The term also appears in modern branding and product names, where it is chosen for its solar connotations. Companies and products adopting the name Helio have appeared in telecommunications, energy, and consumer electronics, among others, though these uses refer to different entities and are not inherently connected.

The term is related to Helios, the sun god in Greek tradition, and to heliography and heliotherapy, which reflect sun-based methods or subjects. In other languages, Helio can function as a given name or surname, further diversifying its use.