Business questions regarding the letters at the end of company names (AG, NV etc)

Ok, so I’m doing a reaserch on Gucci for a international business course and I have some difficulty figuring out what those letter mean

NV, AG, SA

Like in Channel SA, Gucci Group NV, Moët Hennessy Louis Vuitton SA and Compagnie FinanciEre Richemont AG
Is that particular to each company, like for example if the name is too long they just take the first letters of the last words , or is this financial jargon? if its financial stuff, what other combination of letters can be found and what do they mean?

They denote corporate status. Here is a list:
http://www.lib.uwo.ca/business/cfba.html

cool! that’s exactly what I was searching for!

thanks!