== Symbol == 

 Why does the lead of the this article contain detailed information on making the symbol for the Cambrian? Much less, why is it even necessary? Is it so important that the symbol "Є" be covered at all? I've commented it out, but only on the grounds that this is baffling. If it must be kept, surely it can be moved out of the introduction. Or even footnoted if it is given to be so important that means of its insertion need be discussed.