Google Timer :: what is "one raised to one"? I only recently needed to use Google Timer and I was surprised to see this (highlighted in screenshot) and couldn't find any explanation in Timer Help nor in Android developers

Google search didn't help ( admittedly not deep). It sounds dumb but what is this 1 raised to 1 and how to use it ?

Moto X Play, 6.0.1
The button +1' will add 1 minute to the timer. It's a convenience function to extend the timer so that you don't have to stop the timer, add a little bit of time, then restart it. 

I am not aware of any way to change the extension value. If you want to make drastic changes to the timer running, it's easier to stop the timer and start a new one with a different value. Otherwise, you are constrained by adding 1 minute at a time.