Internationalized Domain Names (IDNs)

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            IDN Variants explained:
            Due to overlap in characters between the Simplified and Traditional forms of Chinese, if both were allowed to exist as domain names, they would cause confusion. So, users must choose one to be the primary and the other one is simply reserved and blocked from registration. We chose Simplified, since it is predominately used in mainland China.

            This treatment of variants is common to all TLD's that use IDN's. Verisign provides more details here:

            IDNs - Character Variants and Language Tools

            To resolve an Internationalized Domain Name (IDN), the Domain Name System (DNS) has to translate local language characters into Unicode and connect them to a domain name. Because different languages use the same script, an overlap exists. A character-by-character substitution without language context creates variants that result in confusion and misunderstanding. When an IDN is registered, it is important that the DNS understands the context of the characters and the language they relate to in order to help Internet users reach their intended destination, and to prevent two IDNs from having essentially the same name.
            Chinese Character Variants

            Many languages may have character variants that could potentially cause end-user confusion. For example, the Chinese language has two written forms: Simplified Chinese, used primarily in Mainland China, and Traditional Chinese, used primarily in Taiwan, Hong Kong and other Southeast Asian countries. The two languages share many characters, however, simplified characters in Simplified Chinese may have the same meaning as complex characters in Traditional Chinese. These characters, called character variants, have the same meaning and pronunciation, but they do not look the same.

            A user in Mainland China entering a domain name in Simplified Chinese could be directed to one site, while another user in Taiwan entering what they perceive to be the same domain name in Traditional Chinese is directed to a different destination. To some Chinese speakers, ? and ? are equivalent - they have the same meaning. If both of the following IDNs were permitted to exist, there may be confusion for end users.
            Updated: 19 Oct 2018 03:03 AM
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