Quote from Roy Fokker
It's from the movie "The Matrix".
The way the resistance contacts Neo/Anderson through the Matrix is through internet messages. The first contact is established by the resistance by sending Neo the message "Wake up Neo" right before Neo opens his eyes (having fallen asleep at his keyboard).
Thanks for clearing that up, Roy. Not being a sci-fi/fantasy fan, I've never seen "The Matrix" and hadn't the slightest idea where that icon came from. I swear, I'm still learning something new every day I live.