Why do the button '5' have a point in mobiles, remotes, etc.?

Question

Why do the button '5' have a point in mobiles, remotes, etc.?

Answer 1

the 5 key is the center key - the raised bump on the key allows a person familiar with the layout of the keypad to use it without looking at the numbers only by using the relative position of the keys.

Answer 2

I think it is so you can find the middle button and then find the other numbers from there. (incase it is dark or you can't see, etc.) I have no proof but it is the only possibility that makes sense to me.

Answer 3

for blind people to be able to know where the buttons are from that point, also if you know that bump is 5, you dont have to look yourself.