surrogate
A substitute (usually of a person, position or role).
A person or animal that acts as a substitute for the social or pastoral role of another, such as a surrogate parent.
(chiefly Britain) A deputy for a bishop in granting licenses for marriage.
(US, politics) A politician or person of influence campaigning for a presidential candidate.
(US law) A judicial officer of limited jurisdiction, who administers matters of probate and intestate succession and, in some cases, adoptions.
(computing) Any of a range of Unicode codepoints which are used in pairs in UTF-16 to represent characters beyond the Basic Multilingual Plane.
(economics) An ersatz good.
(databases) A unique identifier for an entity or object, not derived from application data.
Of, concerning, relating to or acting as a substitute.
To replace or substitute something with something else; to appoint a successor.