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ANSI/ITSDF B56.1-2009, (Revision of ANSI/ITSDF B56.1-2005)
SAFETY STANDARD FOR LOW LIFT AND HIGH LIFT TRUCKS
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Part IV - Glossary of Commonly Used Words and Phrases

attachment: a device other than conventional forks or load
backrest extension, mounted permanently or removably
on the elevating mechanism of a truck for handling the
load. Popular types of fork extensions, clamps, rotating
devices, side shifters, load stabilizers, rams, and booms.

attachment, removable: an attachment that can be
mounted on the forks, or in place of the forks on the
carriage, by means of such conventional fasteners as bolts,
pins, etc., and that does not require the disassembly of any
other portion of the lifting system to install or remove.