I got a new notification

You earned Sufganiyot on Web Application!.

What is this "Hat"? You can see in my profile picture I wore this. Can anyone give a brief information about this?

up vote 11 down vote accepted

It's a part of Winterbash 2015

Starting now and going until the end of the day on Jan. 3, 2016, you'll once again be able to earn and show off hats for all sorts of things you're already doing across the Stack Exchange network.

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