This thing. I have no clue what it is.
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That's funny, never seen it before myself :S – Sorean May 18 '11 at 1:44
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I don't play Starcraft, so I can't say for sure, but two guesses: 1) A GUI button to submit typed text (instead of hitting Enter), 2) A button that allows you to change your font styling (bold, italic, underline, colour, etc) – Margaret May 18 '11 at 2:33
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3Have you tried clicking on it? – gbsod May 18 '11 at 2:54
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It can't be clicked on and it doesn't have a tooltip like a clickable button would. It also doesn't change with Caps Lock or Num Lock. Hrm... – Adam Lear♦ May 18 '11 at 3:02
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I had to test it out, I added a friend to a party and the icon doesn't show up for me. Any other tips on reproducing this? – Sorean May 18 '11 at 3:32
It shows the configuration of your keyboard, allowing to change between alphabets, for example from latin to cyrillic or korean.
It is used for players discussing in different languages and needing different keyboard configurations.
EDIT: So I tested a bit around.
I installed the russian and english keyboard layouts on my Windows system and checked that I could switch from my french layout "FR" to russian "RU" or english "EN" by pressing ALT+SHIFT.
I then launched Starcraft 2. I can confirm that the "A" means latin characters and RU means cyrillic characters. English and French layouts both show an 'A' because both use the latin alphabet.
This sign indicates selected language. For me there are 'En' and 'Ru' states of this icon.