T.NF is an extremely rare and valuable one letter domain name which can be understood as simply "T" or as the acronym "TNF".
.NF: ccTLD of Nortfolk Island
Renewal cost: $152
T.ag sold for $60,000 on Sedo.com
T.de sold for $35,228 on Sedo.com
T.md sold for $8,000 on Sedo.com
From the startup to the Forbes 500 company, a one letter domain is a very valuable asset endorsed by all innovative people.
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a.co z.cn (Amazon)
a.im (Aol Instant Messenger)
n.pr (National Public Radio)