There are a couple I have in mind. Like many techies, I am a huge fan of RSS for content distribution and XMPP for federated communication.
The really niche one I like is S-expressions as a data format and configuration in place of json, yaml, toml, etc.
I am a big fan of Plaintext formats, although I wish markdown had a few more features like tables.
Knowing whether it may snow or rain depending on whether you are below or above 0 is very useful though. 0 and 100 are only intuitive because you’re used to those numbers. -20 bring very cold and 40 being very hot is just as easy.