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Re:Oldest domains in the .com, .net, and .org TLDs by cbhl on Tuesday June 26, 2018 @01:36PM (#17402561)
https://en.wikipedia.org/wiki/Single-letter_second-level_dom...

tl;dr: IANA reserved all the single-letter domains in 1993, except for some that had been grandfathered in.

All the two-letter .com domains are registered, and only available on the secondary market.

Re:Oldest domains in the .com, .net, and .org TLDs by chejazi on Tuesday June 26, 2018 @03:20PM (#17403308)
There's also single-character punycode domains, e.g. ¢.com which converts to http://xn--8a.com