For some reason, those 3 horizontal bars centered in this Jabber client application is something I associate with something you can drag down, but I can't remember at all why I associate 3 bars with something that can be pulled down.
My question is, what do these 3 horizontal bars represent universally, and when did it start doing so? I think I also remember seeing this symbol somewhere on Apple phones but also don't remember where exactly.
Answer
It is a skeumorphic depiction of notching, indicating that the area can be pulled/dragged. Similar to the notching on the end of the gun slide (providing extra grip to the fingers).
This appeared as early as Windows 98 (see the bottom right corner of window).
Edit: This is not unique to guns, but more of an industrial design technique. See here the battery pack slides out the bottom:
This slide plate from a sewing machine has similar grooves for fingers to pull on:
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