If you're referring to chemical polarity, then water is a common polar substance. It's polar because at the particle level, a water molecule has a positive end and a negative end (caused by unshared electrons between hydrogen and oxygen.) As a result, water is able to dissolve many other substances which are also polar (like salt.)
depending on what the criteria for real world examples is it can be anything from a rocket to a golf club swinging and hitting a gold ball which in turns makes the golf ball go flying
In my openion bubbles in the soap film is the real examples of it.
You reading this answer.
Carin and machines
'Polarity' has a number of meanings, generally involving the distinction between positive and negative.
south and north pole or left and right hand or a girl and a boy
Men and women
-- negative polarity -- positive polarity
in the real world
Roads are an example of intersecting lines in the real world.
metals
The Grand Canyon.
A Jarlid
Scales or balances.
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McDonalds Arches
Balls