[kazinator]

But a cathode is that terminal of the device where positive current escapes!

It's only a "cathode ray" because it's reversed inside the tube: the terminal where positive current comes out of the device is where the negative current emanates internally to go to the other terminal.

An electron beam shooting out of a device is an anode ray.

[afiori]

I always mix them up... :(

[kazinator]

If we make an oscillating circuit by hooking up an inductor and capacitor and set it in motion, the devices are constantly switching their terminal designations between anode and cathode with each zero crossing. The terms are completely useless, except when talking about vacuum tube circuits and such.