To be fair anyone can call it what ever they want to call it.

They most likely refer to it as being the notification button because the default function when pressed and held for a few seconds is muting and unmuting the devices notification and or ringer.

Oh that makes sense, I was imagining loads of bins in the same place at your house

Fair enough, I mean I do but they are all general waste

So you have multiple bins in your house?

For me it’s trying to put on a screen protector on my phone then afterwards noticing that spec of dust just sitting there in direct view