What are homograph domain names?

According to the .gr domain registry, homograph domains are defined as “domain names that visually match the assigned domain name in lowercase or uppercase, accented or non-accented form, e.g. ΜΑΤΙΝΑ.gr (with Greek characters) and MATINA.gr (with Latin characters), or ΜΑΤΙΝΑ.ελ (with Greek characters) and MATINA.ελ (with Latin characters).”

Source: https://www.eett.gr/opencms/opencms/EETT/FAQS/DomainNames/sunthesi.html

By registering a .gr or .ελ domain name using Latin characters, you reserve a set of homograph domain names with Greek characters (e.g. accented and non-accented forms, final sigma, standard sigma, etc.). You can activate them by contacting Papaki Support. The activation of these homographs is chargeable.

By registering a .gr or .ελ domain name using Greek characters, you reserve a set of domain names with Greek characters (e.g. accented and non-accented forms, final sigma, standard sigma, etc.), as well as the homograph domain name with Latin characters. You can activate these domain names by contacting Papaki Support. Activation is chargeable.

Note: If you register the accented form of a .gr/.ελ domain name with Greek characters, the non-accented form is automatically activated free of charge. However, if you register the non-accented form of a .gr/.ελ domain name, activation of the accented version is chargeable.