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place·hold·er  (plshldr)

n.

1. One who holds an office or place, especially:

a. One who acts as a deputy or proxy.

b. One who holds an appointed office in a government.

2. In a mathematical or logical expression, a symbol that may be replaced by the name of any element of a set.

3. In the decimal form of a number, a digit that is not significant.

Thesaurus

Noun	1.	placeholder - a person authorized to act for another procurator, proxy agent - a representative who acts on behalf of other persons or organizations
	2.	placeholder - a symbol in a logical or mathematical expression that can be replaced by the name of any member of specified set variable - a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity