[WalterBright]

https://www.caltech.edu/ tells the tale.

I've never seen it spelled CalTech in anything from the university nor from any techer.

[brokensegue]

"CalTech" used to be correct

[HHest]

Reference?

[brokensegue]

there are signs around campus that still use the old spelling.

[selimthegrim]

The one on the exit ramp from the 210 doesn’t count