A talisman of the machine god.

I used to work at a nonprofit where our server room’s fire suppression equipment consisted of a single handheld extinguisher and a “Guardian Angel of Computers” wall hanging. I once asked my boss how long it would take to restore from our offsite backup if a fire trashed the servers, and he (jokingly) asked me not to bring it up because he was trying not to think about it. (As a small nonprofit, there was obviously no budget to refit the room with an inert gas system, or anything like that.)

Reminds me of the Kanda Myojin Shrine in Tokyo, where you can get charms to keep the evil spirits out of your computers