Here in Ireland we're starting to see problems with the use of commas and periods/fullstops in Euro prices.
(? = E as some character sets don't display ? properly yet)
Price = 2 euro 99 cent
Ireland: E 2.99
Elsewhere: 2,99 E
Generally for amounts in thousands it's far safer to avoid comma usage completely and use spaces.
e.g. E 2 000.69 can't be confused.
There's also a weird convention in Ireland that "Euro" and "Cent" have no plural (i.e. "2 euro and 15cent, not 2 euros and 15 cents). Apparently the logic being that they should be pan european words and not suffixed with various plural endings (s/en/i/es etc)
Does that apply elsewhere too?
Also the position of the Euro Symbol (?) ... We always put £ before the amount but many other countries put their symbol after the amount and are continuing to write Euro prices the same way e.g. 2,99 E(?)
...
On another convention phone numbers. The french style systems always throw me. i.e. 01.23.45.67.89
Here we tend to have 012 345 6789 and for some reason it's easier to remember in those clumps.
You also tend to get no's like 012 200 3000 (oh one two, two hundred three thousand) for business' main numbers.
1-800 XXXXXXX (one eight hundred)
The weird one in ireland is the premium rate nos.
e.g. 1550 22 99 00 (fifteen fifty, twenty two ninty nine, double zero)
Increasingly letters are being used in 1-800/1-850 and premium rate numbers as well as SMS lines.
e.g. 1-800 EIRCOM or 1-800 AER LINGUS.. seems to allow flexible number lengths to cope with names.