ACRONYM: In The Watch Industry & ISO 6425 Standard Document

316L - low carbon molybdenum-bearing stainless steel (used by many watchmakers)
904L - a non-stabilized austenitic stainless steel with low carbon content (used by Rolex)
AD - authorized dealer
AR - anti-reflective coating
ATM - atmosphere (1 ATM = 10 meters), used in water resistance measurement
Bevel - see [Chamfer]
BNIB - brand new in box
BPH - beats per hour

Chamfer - To form a flat surface by hand-filing the sharp edge of a bridge, plate, screw head, etc.

COSC - Controle Officiel Suise de Chronometres (Official Swiss Chronometer Testing Institute)
DSSD - Rolex Deep Sea Sea Dweller
FS - for sale
FSOT - for sale or trade
GMT - Greenwich Mean time
GS - Grand Seiko
GST - Goods & Services Tax
GTLS / H3 - Gaseous Tritium Light Source
GV - glace verte (green crystal on a Milgauss)
HARDLEX - Seiko proprietary type of hardened mineral crystal
HOMAGE - watches with designs strongly resembling iconic watches 
JDM - Japanese Domestic Market
LE - limited edition
LNIB - like new in box
MOP - mother of pearl
MPa - Mega Pascal (pressure)
MSRP - manufacturer suggested retail price
NIB - new in box
NOS - new, old stock (unused but older model)
OEM - original equipment manufacturer
PAM - Officine Panerai Model
PR - power reserve
RRP -  recommended retail price
SL - superluminova
SOTC - state of the collection
SRP - suggested retail price
UTC - coordinated universal time
VPH - vibrations per hour 
WIS - watch idiot savant
WOMW - what is on my wrist
WRUW - what are you wearing
WTB - want to buy
WTT - want to trade




Ceramics - Strength between 1000MPa to 4000 MPa, Weight 3 g/cc

Titanium Grade 2 - Commercial Purity, 350 MPa, Weight 4.5 g/cc

Titanium Grade 5 - Ti-6Al-4V, 1000 MPa, 1000 MPa, 35 Rockwell C hardness, Weight 4.5 g/cc

ISO 6425.pdf on Scribd