Sure, there are 1 character names for every TLD. Whether they are released to the public or not is a different story.
x.com is also a failed Web 1.0 Internet bank. ~~~~~~~~ "To attract new clients, X.com offered $20 to anyone who opened a free online checking account. Members who referred new customers to X.com were awarded $10 for each referral. Instant credit was also available to those who qualified." -source ~~~~~~~~ They raised a bunch of VC $$$$ "Roughly $25 million in venture capital" Then they gave account holders millions in very EZ credit The plan failed I'm pretty sure they were close to bankrupt when Paypal took over.
the forum curency you get when you post (basically pay per post forum where you have to do donkey work to get domains)
Its near impossible enough to get one of those domains without some serious financial backing behind you.