Examples

Using numerical identifiers
fe80::1234%1
fec0::5678%2
ff02::9abc%5
ff08::def0%10

Using interface names as identifiers
fe80::1234%ne0
fec0::5678%ether2
ff02::9abc%pvc1.3
ff08::def0%interface10
Note: there might be some confusion in use of interface names for identifiers of a larger scope.
When more than one interface belongs to a same site, which interface should be used?
A mapping function from an address to a name would encounter a same kind of problem.