Marc Brett wrote:

112 is also the emergency number for all of the European Union.

most parts of the World seem to use either 112 or 911, though many
places also have an older number of their own which can still be used
as well, as we do with 999. There would seem to be a case for having
both 112 and 911 available to contact the emergency services, that way
a visitor from most of the World would be able to get through on a
number that they are familiar with.