<p>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)</p>

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

CC BY-SA 4.0
2019-02-17T19:18:47.077Z
2019-02-18T13:12:26.773Z
2019-02-18T13:12:26.773Z
M.A
<p>You see it in season 2, episode 12, 16 minutes in. When Kirito is fighting death gun, Asuna enters his room and the BLK light is blinking blue. Therefore, BLK is the Brain LinK in it's activated mode.</p>

CC BY-SA 4.0
2023-07-25T00:25:35.103Z
2023-07-25T00:25:35.103Z
Callum Ridings
<p>I've noticed that all the various NerveGear iterations in <em>Sword Art Online</em> have three LED's on the left side, labeled POW, WAN, and BLK.</p>

<p><a href="https://i.sstatic.net/3LwSQ.jpg" rel="noreferrer"><img src="https://i.sstatic.net/3LwSQ.jpg" alt="enter image description here"></a></p>

<p>I think it's safe to say that POW is the power, and WAN is the <a href="https://www.networkworld.com/article/3248989/lan-wan/wide-area-networks-what-wans-are-and-where-theyre-headed.html" rel="noreferrer">internet connection</a>.  What is BLK?</p>

CC BY-SA 4.0
2018-10-22T15:19:45.903Z
I haven't found anything official, but a few reddit posts say it might stand for "**B**rain **L**in**K**" since the light appears to only be on when the user is logged in
Wondercricket
CC BY-SA 4.0
2018-10-22T15:26:26.020Z
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
CC BY-SA 4.0
2018-10-22T15:34:09.013Z
Someone asked the same question on [Yahoo! Chiebukuro](https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q13197836408) 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
CC BY-SA 4.0
2018-10-22T16:04:28.563Z
@AkiTanaka Not me, just a coincidence (I don't speak Japanese unfortunately).
PlutoThePlanet
CC BY-SA 4.0
2018-11-09T07:17:21.197Z
@PlutoThePlanet: BLK is not black, it's slowly blinking blue, see the opening of the Alfheim arc (https://www.youtube.com/watch?v=gAi4PwjTfRU) or https://tinyurl.com/y97m87u8
Teem Porary
<sword-art-online>
What does the LED on the NerveGear mean?
# What does the LED on the NerveGear mean?
Posted by: username_0 on 2018-10-22
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.

[![enter image description here](https://i.sstatic.net/3LwSQ.jpg)](https://i.sstatic.net/3LwSQ.jpg)

I think it's safe to say that POW is the power, and WAN is the [internet connection](https://www.networkworld.com/article/3248989/lan-wan/wide-area-networks-what-wans-are-and-where-theyre-headed.html). What is BLK?
**Tags:** sword-art-online
> **Comments:**
> **username_1**: I haven't found anything official, but a few reddit posts say it might stand for "**B**rain **L**in**K**" since the light appears to only be on when the user is logged in  
> **username_0**: 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.  
> **username_2**: Someone asked the same question on [Yahoo! Chiebukuro](https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q13197836408) 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.  
> **username_0**: @AkiTanaka Not me, just a coincidence (I don't speak Japanese unfortunately).  
> **username_3**: @PlutoThePlanet: BLK is not black, it's slowly blinking blue, see the opening of the Alfheim arc (https://www.youtube.com/watch?v=gAi4PwjTfRU) or https://tinyurl.com/y97m87u8  
---
## 2 answers
### Answer by username_4 on 2019-02-17. Score: 5
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.
---
### Answer by username_5 on 2023-07-25. Score: 1
You see it in season 2, episode 12, 16 minutes in. When Kirito is fighting death gun, Asuna enters his room and the BLK light is blinking blue. Therefore, BLK is the Brain LinK in it's activated mode.
---
