What is the Latin word for ID/identifier?

1. What is the word ID in Latin?
2. Is ID Latin or Greek?
3. What does the prefix ID mean?
4. Is ID an initialism?

What is the word ID in Latin?

idem is a Latin term meaning "the same". It is commonly abbreviated as id., which is particularly used in legal citations to denote the previously cited source (compare ibid.). It is also used in academic citations to replace the name of a repeated author.

Is ID Latin or Greek?

Borrowed from Latin id as a translation of German Es from the pronoun es (“it”).

What does the prefix ID mean?

(not productive except in zoology) of or pertaining to; appended to various foreign words to make an English adjective or noun form. Often added to words of Greek, sometimes Latin, origin.

Is ID an initialism?

According to CMOS, "ID" is an initialism (http://www.chicagomanualofstyle.org/16/ch10/ch10_sec002.html) and should be capitalized and used without periods.