[politics] In politics, a placeholder is an official appointed temporarily to a position, with the understanding that they will not seek office in their own right. The situation often occurs in cases where a United States Senator leaves office before the expiration of their term. In most states, governors have the power to appoint a replace... Found on http://en.wikipedia.org/wiki/Placeholder_(politics)
noun a symbol in a logical or mathematical expression that can be replaced by the name of any member of specified set Found on https://www.encyclo.co.uk/local/20974