I have noticed that in Dynamics NAV 2013 that some TextConsts have started using @@@ as the language code.
For example in Codeunit 12:
PurchaseAlreadyExistsErr@1003 : TextConst '@@@="%1 = Document Type;
What does @@@ mean in this context?
They're there as translation comments. My friend Jan Hoek his written a nice blog post on this: http://mibuso.com/blogs/zenandtheartofcsidedevelopment/category/textconstants/. So 'help yourself' ;-)