1) A small hole in aeroplane window
:- If you did air travel then you migh have noticed there was a small hole in Aeroplane window the purpose of this hole is to maintain air pressure inside flight
2) A small knob in laptop or other electronics charger
:- you have noticed that your laptop charger have small knob inside this knob ferrite present. This ferrite cancel the electromagnetic ray.
3) A small pocket on jeans pant
:- A small pocket on jeans pant might be you have noticed. This is made for keep pocket watch. When jeans develop that time people dint have wrist watch so people keep pocket watch inside this small pocket
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