The Complete Manual of Typography320
quad In metal type, a nonprinting block of metal used as a spacing element.
quad center A typesetting command that ends a line of type and centers it
within its measure (by adding quads—real or virtual—before and after it).
quad left A typesetting command that instructs the system to end a line of
type and set it flush left, filling the rest of the line with quads (real or virtual).
quad middle A typesetting command that instructs the system to insert
enough quads (real or virtual) at the point it was issued to drive the text on
either side of it to set flush against the right and left margins.
quad right
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