Welcome to θ.com!
The name of this domain is θ.com; it is an Internationalized Domain Name (IDN). According to the Unicode standard, the name for the θ character is "Greek small letter theta". One way to reach this domain is to type the punycode representation www.xn--txa.com in your browser bar. The Unicode code point for this character is U+03B8.
The Greek letter θ (theta; capital form: Θ) is familiar world-wide as the symbol for a plane angle in trigonometry. According to the Wikipedia article on θ, the common usage of θ in mathematical problems began with the ancient Greeks.
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Image from Wikipedia