Xerox Color 800 User Manual page 283

Single Fold (Bi-Fold)
A Bi-Fold has one fold which creates two panels to the output.
Note
The Single Fold option is available only with the Booklet Maker Finisher.
C-Fold
A C-Fold has two folds which creates a three-panel output.
Z-Fold
A Z-Fold has two folds that are folded in opposite directions, resulting in a type of fan
fold.
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Xerox Color 800/1000 Press
User Guide
Standard/Booklet Maker Finisher
17-5