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I've noticed that all the various NerveGear iterations in Sword Art Online have three LED's on the left side, labeled POW, WAN, and BLK.

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I think it's safe to say that POW is the power, and WAN is the internet connection. What is BLK?

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    I haven't found anything official, but a few reddit posts say it might stand for "Brain LinK" since the light appears to only be on when the user is logged in – Wondercricket Oct 22 '18 at 15:19
  • I saw a fanfiction story that claimed something similar, but of course it's not the least bit canon. Also, I don't remember that light ever actually being on-- POW is usually solid green and WAN blinks, but BLK always seemed to be black. – PlutoThePlanet Oct 22 '18 at 15:26
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    Someone asked the same question on Yahoo! Chiebukuro recently and didn't get answered yet (is that you?). Note that I also failed to find any related info about those LED in Japanese. – Aki Tanaka Oct 22 '18 at 15:34
  • @AkiTanaka Not me, just a coincidence (I don't speak Japanese unfortunately). – PlutoThePlanet Oct 22 '18 at 16:04
  • @PlutoThePlanet: BLK is not black, it's slowly blinking blue, see the opening of the Alfheim arc (youtube.com/watch?v=gAi4PwjTfRU) or tinyurl.com/y97m87u8 – Teem Porary Nov 9 '18 at 7:17
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There is nothing confirmed as of now, however we can see that the most applicable name to give according to online discussions is Brain LinK (BLK)

The blinking may suggest a weak link or solid colored a firm connection and so on.

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