placeholder

/ˈpleɪsˌhoʊldɚ/

IPA: /P L EY1 S HH OW0 L D ER0/

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.

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Source: https://en.wiktionary.org/wiki/placeholder