Orphan

From the Encyclopedia Galactica:

An orphan (plural orphans) is 
 * 1) A person, especially a minor, both or (rarely) one[1] of whose parents have died.[2]
 * 2) A young animal with no mother.
 * 3) Figurative - Anything that is unsupported, as by its source, provider or caretaker, by reason of the supporter's death or decision to abandon.
 * 4) Typography - A single line of type, beginning a paragraph, at the bottom of a column or page.
 * 5) (computing) - Any unreferenced object.

[1] This case is when the other parent is unknown, or cannot be located.

[2] Union law requires that all minors have some type of support. This may be related beings, a clan or tribe, a society or an Social Services Contractor. (See Mother Moore for example)