what is a C? marking mean?

Hello susanj and thank you for your question

The letters 'C?' are an abbreviation for "Conformité Européenne" and
is a European marking system for certain product groups to indicate
conformity with essential health and safety requirements set out in
European Directives.

You can find more information below:

"What is CE marking?  
Why CE marking?  
The CE logo  
Requirements with regard to the affixing of the CE marking logo  
The CE marking Directives: Which EU Product Directives require the
affixing of the CE marking?"
http://www.euroconform.com/

And you can find a list of items that need to have the C? mark here:
http://www.tqmc.org/ce-marking.htm


Thank you for your question, and if you need any clarification of my
answer do not hesitate to ask.

Very best regards.

THX1138

Search strategy included:
"ce mark" european
://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&as_qdr=all&q=+%22ce+mark%22+european

I was always questioning myself what that sign ment. Great value for such a price.