trmm.net is available as a Tor hidden service, an "onion site": trmmnetdlgchymew.onion. This allows users of the Tor browser to reach the site without having to go through an exit node.
Here are some other sites that have hidden services:
- https://www.facebookcorewwwi.onion/ - facebook
- https://protonirockerxow.onion/login - protonmail
- https://www.nytimes3xbfgragh.onion/ - New York Times
- https://www.propub3r6espa33w.onion - Pro Publica
The hostnames are generated via hashes of the SSL key, which is why they are not simple words. There are tools that help generate "vanity keys" where the first few letters match some regular expression - the more letters you want to match the longer it takes.