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"Such domains are rare, as on December 1, 1993, IANA explicitly reserved all single letter and single digit second-level domain names in the TLDs .com, .net, and .org. This was done in case the registries for these domains became overloaded. Recently, ICANN has considered auctioning off their domains.
However, the few such domains that were already assigned were not recalled; They were grandfathered in and therefore were not affected by the restrictions that have existed since."
Paypal has X.com, Nissan has Z.com and Qwest has Q.com.
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