Bookmark, essentially

Usage examples of placeholder.

But it was an explanation that could serve as a scientific placeholder until something better came along.

Lee meant the phrase as nothing but a polite conversational placeholder, but Rhoodie nodded all the same.

And gradually a lame placeholder of a line became locked in place and is now formally part of the song, part of the movie, and so on.

Day, she never left the Placehold, and she never spoke to men, visitors, or single Placeholders, except for Whandall.

It was a work-in-progress, blocks of as-yet-unwritten code replaced with cryptically labeled placeholders, but the basic intent was clear enough.

Pieces of the backup warp-drive were all over the floor, or hovering on placeholders, and Scotty was thundering around among his engineering ensigns, shouting at them.

Usually, index references were tied to important words, so that if you just wanted to stop and think without bringing up a bunch of references you didn't want, all you had to do was keep your gaze focused in an area of placeholder words, empty phrases like “If this were all that could be …” Anyone who made it a habit to read indexed works soon learned this trick and used it till it became reflex.