[Eric] “(sig)” specification

[Pietro Moras]

On the “http://www.python.org/download/releases/3.3.0/” site I read:  •Windows x86 MSI Installer (3.3.0) (sig) 
Well, what does it mean, what is it to tell me this “(sig)” specification, I mean apart from the literal acronym meaning of “Special Interest Group”?
I thought somebody here could help me clarify this little doubt. 
Thank you.
 - P.M.
 		 	   		  
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