At Cloudflare’s SF office, the conference rooms are all numbered after HTTP status codes. Our Board Room is 404. The coffee shop (Cafe Lambretta) in our building, at the corner of 2nd & Townsend, is bookable in our calendar system as Room 418.
There's a FAANG office which also uses 4xx status codes, but as you would expect, 404 is missing, and 403 is permanently locked (spoiler: it's a door mounted on a wall with nothing behind it). 418, on the other hand, is decorated with whimsical teapots.
> the conference rooms are all numbered after HTTP status codes
Sigh, conference room naming systems! I worked somewhere many years ago where the conference rooms were named after birds of prey: falcon, kestrel, eagle, etc. The smoking room (back in the day) was informally named 'puffin'.