employeeNumber

From PALDAP

Numeric or alphanumeric identifier assigned to a person, typically based on order of hire or association with an organization. Single valued.

The employeeNumber (Employee Number) attribute type is defined in RFC 2798, section 5.4.

[edit] AttributeTypeDefinition

( 2.16.840.1.113730.3.1.3 NAME 'employeeNumber'
  DESC 'numerically identifies an employee within an organization' 
  EQUALITY caseIgnoreMatch
  SUBSTR caseIgnoreSubstringsMatch
  SYNTAX 1.3.6.1.4.1.1466.115.121.1.15 
  SINGLE-VALUE
)