I have to go with the crowd saying that currency symbols are silly things and should be deprecated. I never liked the euro symbol, it's awkward to write by hand or type with keyboard. And extra awkward with limited/non-standard keyboards such as those found on mobile devices. I usually use just "e", eg. 10e (with or without space depending on context). If I need to be more explicit or formal for some reason then I'd use EUR or just spell out the full name (eg. 10 euros). There is some benefit of having a four-letter name for your currency.
On a related note having your currency symbol as a prefix is also bit awkward as no other units generally are used as prefix. That's why I often prefer to write 10 usd instead of $10.
On a related note having your currency symbol as a prefix is also bit awkward as no other units generally are used as prefix. That's why I often prefer to write 10 usd instead of $10.