wlan0 - what is it?

I'm having a hard time figuring out how to configure wlan0... Can anyone show me how to do it?

I have an Intel Centrino Ultimate-N 6300 chip which I believe is supported in FreeBSD 10.0-STABLE, and iwn0 shows up in dmesg() on bootup or if I run ifconfig, but I guess I'm missing something... I don't think wifi is getting activated, at least the wifi doesn't come on. (It works fine in Windows).

Wherever I read about wifi in the handbook or in tutorials it mentions ifconfig wlan0 list scan, but I don't know where to find wlan0...
 
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