What is the name of the Windows System Menu button?

[Complete]

What is the name of the Windows System Menu button?
I am talling about the round glass-orb looking object (on a Windows 7 operating system) that appears in the lower left of the screen -- usually -- that you can click on to see the menu selection of programs on your compter.

 

[LordOfLA]

start button

 

[ZeroHour]

......

 

[Malachov]

hmm.. strange
The Cardigans is best selling artist - abcmuzic.com

 

[Johnny]

This is a question that proves the concept of no question being a stupid question ..