Probably A Dumb Question on the T637

I'm sure this is a dumb question, but maybe someone can help me out here. Can anyone tell me what the small grid of 4 squaresis above the joystick on my T637? On the main screen, this grid sits between the "Calls" and the "More" sections, and I can't for the life of me figure out what it's supposed to represent.

Best guess, is that it's supposed to represent the "Desktop", the grid of icons that appears when you hit the joystick straight down. Is that right? If so, that's a horrible icon...

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I think it represents the four main buttons on the keypad. (The "ok, cancel, back, and delete.") If the button could be used...I think it turns blue and shifts position a bit. This is only a stupid guess though.

when you push down on the joystick, and that bunch of icons comes up (menu), that's what it represents.