What is the VPN icon in the menu bar? I have long wondered what the significance of the VPN icon in the menu bar is:



Anyone know?

Edit:

I think people are misunderstanding my question.  It is the icon for the built-in OSX VPN.  I use it regularly.  My question is what the icon itself represents.  A padlock?  A tunnel? A spaceship?
There's a few people think it's an RSA SecurID tag:

http://osx.tribe.net/thread/1ba4a52c-807c-4c6f-bf73-5561bcc208ed

http://www.mactalk.com.au/11/58913-what-does-vpn-menubar-icon-mean.html

Don't know if I buy it though.