What top-level domain do you use in your local network?

I've wanted to install pihole so I can access my machines via DNS, currently I have names for my machines in my /etc/hosts files across some of my machines, but that means that I have to copy the configuration to each machine independently which is not ideal.

I've seen some popular options for top-level domain in local environments are .box or .local.

I would like to use something more original and just wanted to know what you guys use to give me some ideas.