Blank
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There are a number of uses for the word blank:
- A blank (archeology) is a thick, shaped stone biface of suitable size and configuration for refining into a stone tool.
- A blank (Scrabble) is a unique tile that rather than having one of the letters of the alphabet printed on it, it has a blank face and can be substituted for any letter the player desires.
- A blank (cartridge) is a type of cartridge for a gun that contains gunpowder but no bullet or shot.
- A blank expression is either one of slight confusion when someone refers to something which you do not understand or a face where you which to hide your expression from other people.
- A key blank is an uncut key.
Also: blank as in 'unused' or 'clear'; a blank slate, a blank sheet of paper. etc.