I have seen some places referring the C++11 standard as "ISO/IEC 14882:2011(E)", while the ISO site is referring it as "ISO/IEC 14882:2011", without the trailing "(E)".
What does that "E" stand for?
Edit: As for the explanation of revision number, the standard was approved by ISO on Aug 12, 2011, and was published on September. Here is one with the trailing "(E)", and it clearly says the date was Sep 1, 2011. So I think it's unlikely it's already the fifth revision this soon.
AFAIK, the '(E)' indicates an English language standard, as opposed to '(F)' for French. Many of the documents at the ISO web site are available in English and French. In fact, Wikipedia offers some help, noting that the three official languages of ISO are English, French and Russian.
One of the links on the page is to:
The 3 official full names of ISO can be found at the beginning of the foreword sections of the PDF document: ISO/IEC Guide 2:2004 Standardization and related activities — General vocabulary.
If you download the document, you'll see its code is: ISO/IEC GUIDE 2:2004(E/F/R) because it is in English, French and Russian.
I've not yet found where the notation is defined by ISO itself, though, but it will likely be in one of their guides.
J-16 SDiZ notes that the Unicode Consortium web site explicitly states:
Q: Is ISO/IEC 10646 also available for free download?
A: Yes. ISO/IEC 10646:2011 (E) is available for free download from: http://standards.iso.org/ittf/PubliclyAvailableStandards/index.html. The "(E)" and "(F)" in listings on that page refer to English or French editions of standards, respectively.