placeholder

Noun

placeholder (plural placeholders)

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.
   • As the years go by, speech reverts to childhood levels of disfluency, with more pauses, more errors, more repeated words, but even the peak years are not great: up to 8 percent of the average person’s word output consists of meaningless fillers and placeholders like um, uh and er.2007 August 24, William Grimes, “Uh, Lead My Rips: No More Bloopers”, in The New York Times, archived from the original on 04 Jan 2013
2. A non-editable caption initially displayed in a blank text box to indicate its function.