placeholder
/ˈpleɪsˌhoʊldɚ/ noun C2- 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.
- A non-editable caption initially displayed in a blank text box to indicate its function.
Plural placeholders
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