Words to Describe identifiers

How identifiers often is described ("________ identifiers")

• mnemonic
• distinct
• patient
• numerical
• bit
• explicit
• letter
• specific
• legal
• valid
• liberal
• democratic
• ethnic
• arbitrary
• class
• strong
• predefined
• duplicate
• universal
• formal
• partisan
• object
• additional
• defined
• persistent
• variable
• identical
• subject
• appropriate
• biometric
• internal
• symbolic
• corresponding
• uniform
• logical
• constant
• low
• free
• virtual
• meaningful
• personal
• key
• generic
• invalid
• global
• republican
• following
• geographic
• alphanumeric
• independent
• weak
• different
• unique
• racial
• numeric
• individual
• standard
• local
• conservative
• external
• multiple
• level
• content