I'm not sure exactly what you mean. If you're looking for a production example, then here's one:

Priveasy.org is an open source group that uses P5.vc (the shorter domain's letters sounded-out sound kind of like "Priveasy") to configure its servers, as well as to provide nice, compact links to its users, when accesses account resources.

If you're looking for examples of all short domain names, then I recommend checking-out this link, as provided by Someone: https://catechgory.com/