Yeah. Um there was a mention just as kind of a warning about button design. Um just to avoid ambiguity. So it gave the example of say your volume buttons for up and down , they might both have a V_ on for volume ,  Um let's think how they did this.
Good in in  Flip it round in ninety degree a hundred and eighty degrees and have it up and down.
I'm just gonna check so I do this right.
An upside-down V_. So that would show that volume was going up , whereas the one underneath would see the volume going down.