奇怪的lotus notes图标,是什么?

有关说明,请参见 Hacker's Dictionary

Propeller Head n. 
Used by hackers, this is syn. with "computer geek".
Non-hackers sometimes use it to describe all techies. Prob. derives
from SF fandom's tradition (originally invented by old-time fan Ray
Faraday Nelson) of propeller beanies as fannish insignia (though
nobody actually wears them except as a joke).

这只是早期Lotus Notes开发人员的一个玩笑,意味着只有真正的专家才会对该选项卡上的属性感兴趣。