User's Manual Part 2

Glossary 274
MAC address
A MAC address (Media Access Control address) of a net-
work device is a unique identifier assigned for network data
layer communications purp oses. MAC address are typi-
cally assigned by the manufacturer of a network device, en-
coding the manufacturer’s registered identification number,
and are stored in the device’s read-only memory or other
firmware. Among other uses, a device’s MAC address is a
way of identifying the device for network access purposes.
Mcode
Gcode can contain “miscellaneous” function codes known
as “Mcodes” and which begin with the letter “M”. See
Gcode
MSDS sheet
Material S af ety Data S h ee ts are a widely used system for
cataloging information on chemicals, chemical compounds,
and chemical mixtures – so for instance, the plastic of 3D
printing fi l a m ent. Note th a t 3D pri nting filament, espe-
cially PLA filament, is about as safe as plastic can get; but
for t hose who need an MSDS document in their environ-
ment, Polar 3D has MSDS sheets available for the printing
filament available from Polar 3D; see the Polar 3D support
document Polar Filament MSDS Sheet. See also filament
& PLA
NGSS
Next Generati on Science Standards, released in 2013, were
devel o ped by a consortium of 26 states, the Nat i o n al Sci-