That’s literally just an XLR3 plug. It’s used for analog audio and DMX lighting controls.

Don’t know why you’d put it in a rock though.

There’s a smaller version of type F that has the same frame as type N, just missing the middle pin, so it is reversible. It has the same risk of reversing neutral and phase as type F, but (while I’m no expert) that has never been a problem for me.

It’s missing the European high voltage plugs as well.

relevant xkcd

It is open source, licensed under the Apache License 2.0.

EDIT: Found it on f-droid: https://f-droid.org/en/packages/app.organicmaps/

Have you tried Organic Maps? Works pretty well for me.

base12 has the advantage of being divisible by 2, 3, 4 and 6, while base10 is only divisible by 2 and 5.

Optical Character Recognition. Basically just extracting text from an image.

You can do this in VLC, though it’s not very practical. VLC’s equalizer has a preamp slider, it’s just not great if you want to change it all the time.

Here’s a circular rainbow from an aircraft a skydiver:

EDIT: image embedding didn’t work

EDIT 2: not from a plane

EDIT 3: sorry for all the edits, fixed image