Placeholder

//ˈpleɪsˌhoʊldɚ// noun

Definitions

Noun
  1. 1
    Something used or included temporarily or as a substitute for something that is not known or must remain generic; that which holds, denotes or reserves a place for something to come later.

    "This data is a placeholder, so you'll want to include the real numbers as soon as you have them."

  2. 2
    a symbol in a logical or mathematical expression that can be replaced by the name of any member of specified set wordnet
  3. 3
    A non-editable caption initially displayed in a blank text box to indicate its function.
  4. 4
    a person authorized to act for another wordnet

Etymology

From place + holder.

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