Novelty item strictly.
Names like these don't sell.
Why ?
Because they are confusing: people will try to access a.com - which doesn't exist
How are you supposed to reach that domain if the letter is nowhere to be found on your keyboard. The only way is to click a link. But it cannot be advertised or printed on business cards.
There is a reason why this domain was still available.
Hi there. It's a bit tricky to appraise a domain name like this because not all people have that special symbol on their keyboards.
It's pretty weird but if I remember correctly a domainer here on NP reported that he sold the (Greek letter z).com. You might want to check that out in the completed sales thread.