Technology

or the torx-looking tip with the little raised dot.

That's Torx TR, meaning "keep out if you don't know what you're doing", they're freely and widely available, not stopping anyone just giving pause. Completely different ballpark than vendor-specific heads or one-way heads or stuff someone will sue you for if you produce drivers.

Heck if you buy a random small bit set, not a security one mind you but ordinary, chances aren't small that the Torx bits are going to be TR as you can use them with non-TR torx.

That's not to say that you should use them for user-servicable battery compartments, on the contrary: Those are supposed to be "yep come in it's quite idiot-safe in here" types of places. But you'd want them when you dig further into the phone as doing things the wrong way or just in the wrong order may damage stuff, they belong on PSUs so curious idiots don't kill themselves, such applications.