This is a rare one character .com emoji domain, and yes it is real, and it really works. I acquired it over 10 years ago, ad I am looking to raise money for another project.
This emoji is commonly used to represent cancer, the cancer astrological sign, 69, and yin/yang. And Women's Health magazine says it is one of the top 21 emojis for sexting. So there you have it.
Single character emoji were once registerable in the .com extension. But ICANN rolled that back and disallowed the names altogether. Existing registrants could keep what they had, but if one of these names drops, it can no longer be registered, though existing domains can be transferred.
Rare opportunity to own an extremely rare single-character .com domain that really works.