There are no 1 letter domains available in any extension. You sure it's not a subdomain?
As to any actually currently being available for normal registration, I'd assume your 100% correct...some big spenders grab them all when new ccTLD's open-up. But as to them not existing: Actually quite a few ccTLD's (those belonging to countries) allow them (albeit, at very high prices or at auctions when they first became open). They just don't exists as still grabbable (other than buying from current owner if already registered - grand-fathered-in) in the gTLD's (generics, like .com, .net, etc).
The single character generics that are owned/registered:
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i.net Ltd Future Media Architects
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q.com owned by JG Qwest
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q.net owned by Private Owner (Whois database not required to list any name on this one due to French law.The owner had it up for sale about 2-3 years ago, via Sedo and Afternic, but never sold. )
-- If I had that kind of $ to spend, that I could put toward a domain, that would have been my baby:sold: (q.net: "questions about the net": users-answering-users FAQ site:P)
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x.com owned by PayPal
-- my ULTIMATE domain dream - "X marks the spot!":kickass:
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x.org owned by X.Org Foundation
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z.com owned by Nissan Motors
I don't recall all the ccTLD's that offered or ever did offer single characters, but Afternic currently has 46 up for sale (list has 49, but I'm not inclucing sub-domains of the country-extension):
Code:
http://www.afternic.com/names.php?src=1&skeyword=&tld[]=any&sta=0&cat0=0&cat1=0&lop=&hip=&slength=1&length=1&within=0&ipp=100&sortby=n
Add to that list, that some ccTLD's aren't on that list. For example, I know they are/were avaibale in .tv, for example.