Stands for hyphenation and justification. It's common to arrange text in columns of constant width. However, words aren't constant in length, so some adjustment has to be made.
This is the technique used to give an illusion of different tones (sometimes called greyscales) in printing processes that in reality only use inks of a single density (such as solid black).
Hybrid Side Shooter, a Xaar piezo printhead technology, so far only used in its 1001 and 1002 heads. See Printhead.