What is the pin-like metal embedded at the lower part of aeroplane windows for?

Question

What is the pin-like metal embedded at the lower part of aeroplane windows for?

Answer 1

which plane. my planes dont have that

Answer 2

I"ve been wondering when this question will be ask? it's a pin size hole in the lower portion of the cabin windows and it is called breather hole. the reason as guy no. 2 says. Haven't you notice no misting in there

Answer 3

it's so when you climb and descend, the air pressure changes and if there isn't a hole there, the window could burst!

Answer 4

It looks like a metal pin, but it is actually a small drain/vent hole.  Besides the sidewall panel (really thin clear window), there is also an inner and outer window pane.  That drain/vent hole is to prevent/reduce condensation between those 2 panes.  The temperatures outside the aircraft at cruise altitudes can be colder than -50F, so having multiple layers of window will keep you from feeling that cold air rolling off that window.