Definitions for "ID number"
The five or six digit number printed on your student card. You keep the same ID number throughout your degree.
A coded number assigned to a record that relates it to similarly coded records in a computer or database.
a unique number assigned to each classroom
Keywords:  idnum, field, internal, type, name
(Type: field, Internal name: idnum)
Keywords:  ideal, way
an ideal way to do this