The unit of issue column tells the format of the document (set, sheet, book, etc.) and whether you order it one copy at a time (EA or SH) or in a pad or set.
BK
Book (number of units in book is shown)
BX
Box (number of units in box is shown)
CTN
Carton (number of units in carton is shown)
EA
Each (published as a single card, label, mailer, postal card, tab card, or tag)
HD
Hundred (number of items in package)
PD
Pad (number of sheets in pad is shown)
PG
Package
RL
Roll
SE
Set (number of sheets in set is shown)
SH
Sheet (either a single “cut sheet” or one–part continuous)
