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ADC Atmospheric Dispersion Corrector or Analog to Digital Converter  (Depends on context)
ADI Angular Differential Imaging
AEOS Advanced Electro-Optical System (USAF Telescope on Maui)
AGB Asymptotic Giant Branch
ALMA Atacama Large Millimeter Array
ATEUI Acceptance Test and Engineering User Interface
ALTAIR ALTitude-conjugate Adaptive optics for the InfraRed
AMNH American Museum of Natural History
AO Adaptive Optics
AOC Adaptive Optics Computer
API Application Programming Interface
APLC Apodized Pupil Lyot Coronagraph
AR Anti Reflection (coating for tranmissive elements)
AU Astronomical Unit (1.495 X 1011 m)
ATP Acceptance and Test Plan
AURA Association of Universities for Research in Astronomy
CAL Calibration Subsystem
CANOPUS The optical bench and associated electronics. Everything that is within the box attached to the ISS. Other subsystems of GeMS include the BTO (Beam Transfer Optics), the laser and LSE (Laser Service Enclosure) and the LLT (Laser Launch Telescope).
CCB Change Control Board
CCIT Coherent Communications, Imaging and Targeting
CCC Closed Cycle Coolor (CCR)
CCR Closed Cycle Refrigerator (CCC)
CDR Critical Design Review
CEH Command Event Handler (GPI interface to GIAPI)
CfAO Center for Adaptive Optics
CFHT Canada France Hawaii Telescope
CGS Centimeter gram second system of units
CoDR Conceptual Design Review
CoPI Co-Principal Investigator
CoPM Co-Project Manager
COR Coronagraph
CP Cerro Pachon
CVNDF Continuously Variable Neutral Density Filter
CWS Cold Working Surface
d Subaperture size projected on the primary mirror (18 cm for GPI)
D Telescope primary mirror diameter (8.0 m for Gemini)
DAC Digital to Analog Convertor
DAR Differential Atmospheric Refraction
DARPA Defense Advanced Research Projects Agency
DD Double (image) difference
DHS Data Handling System
DM Deformable Mirror
DMS Document Management system
DRP Data Reduction Pipeline
EFS External Frame Structure
EPICS Experimental Physics and Industrial Control System
ESO European Southern Observatory
ESO VLT European Southern Observatory Very Large Telescope
EXAOC Extreme Adaptive Optics Coronagraph (original name for GPI)
FDRP Final Data Reduction Pipeline
FEA Finite Element Analysis
FITS Flexible Image Transport System
FOV Field Of View
FPRD Functional and Performance Requirements Document
FPM Focal Plane Mask
FSM Fine Steering Mirror
FSS Flexure Sensitive Structure
FTR Fourier Transform wavefront Reconstructor
FWHM Full Width at Half Maximum
GCAL Gemini Facility Calibration Unit
GDSN Gemini Data Storage network
GeMS Gemini MCAO System
GLAO Ground Layer Adaptive Optics
GMOS Gemini Multi Object Spectrograph
GMP Gemini Master Process
GPI Gemini Planet Imager
GPOL Gemini Polarization module (obsolete)
GSAOI Gemini South Adaptive Optics Imager
HCIT High Contrast Imaging Test bed
HEBS High Energy Beam Sensitive
HIA Herzberg Institute of Astrophysics
HL High Level
ICD Interface Control Document
ICS Instrument Control System
IDL Image Display Language (RSI Inc.)
IFS Integral Field Spectrograph
IMF Initial Mass Function
INO Institut Nationale d'Optique
IR Infrared-Red
IRAS Infra-Red Astronomy Satellite
ISS Instrument Support Structure
IWD Inner Working Distance
JPL Jet Propulsion Laboratory
JWST James Webb Space Telescope
LAN Local Area Network
LAO Laboratory for Adaptive Optics
LLNL Lawrence Livermore National Lab
mas milli-arcsec (4.848 nanoradian)
M1 Gemini primary mirror
M2 Gemini secondary mirror
M3 Gemini Tertiary (or science fold mirror)
MCD Motion Control Daemon
MEMS Micro Electro-Mechanical System
MJ Mass of Jupiter (1.8988 X 1027 kg)
MK Mauna Kea
MWBS Multi-Wavelength Beam Splitter
MWI Multi-Wavelength Imager
N Number of subapertures across the primary mirror (44 for GPI)
NCP Non-Common Path
NDR Non-Destructive Read
NIRC2 Near Infrared Camera 2 for adaptive optics at Keck
NIRSPEC Near Infrared Spectrometer instrument at Keck
NRC National Research Council (careful, there is an American and a Canadian one, separate entities)
NSF National Science Foundation
NTP Network Time Protocol
OAP Off Axis Parabola
OCDD Operational Concept Definition Document
OCS Observatory Control System
ODRP On-Line Data Reduction Pipeline
OFC Optimized-gain Fourier Control
OIWFS On-Instrument Wavefront Sensor
OIWGS On Instrument Wave Front Sensor
OMSS Opto-Mechanical Superstructure
OSIRIS OH-Suppressing Infrared Imaging Spectrograph at Keck
OT Observing Tool
OWD Outer Working Distance
PA Position Angle
pc Parsec (3.085 X 1016 m)
PCS Primary Control System
PDR Preliminary Design Review
PE Project Engineer
PI Principal Investigator
Piezo Piezo effect actuator
PN Planetary Nebula
pnCCD pnSensor based CCD.
PM Project Manager
PPM Pupil Plane Mask
PS Project Scientist
PSDI Phase-Shifting Diffraction Interferometer
PSF Point Spread Function
PZT Lead Zirconium Titanate (Piezo effect actuator)
QE Quantum Efficiency
QPT Queue Planning Tool
RFP Request for Proposal
RMS Root Mean Square
ROC Radius Of Curvature
ROI Region of Interest
RPC Remote Procedure Call
RSS Root Sum Square
SC Science Camera
SCC Supervisory and Component-Control Computer (Obsolete, see TLC)
SCS Gemini Telescope Secondary Control System
SD Simple (image) difference
SE Systems Engineer
Seqexec Sequence Executor
SFWFS Spatially Filtered Wave Front Sensor
SNR Signal to Noise Ratio
SOW Statement of Work
SPIE Society of Photoelectric Instrumentation Engineers
SRD Software Requirements Document
SSDI Simultaneous Spectral Differential Imaging
SSD Speckle Suppressing Device
SSICD Subsystem Interface Control Document
SSRD Subsystem Requirements Document
STScI Space Telescope Science Institute
TBC To Be Confirmed
TBD To Be Determined
TCS Telescope Control System
TLC Top Level Computer (for GPI was SCC)
TMA Three Mirror Anastigmat
TPF Terrestrial Planet Finder
TRIDENT Three Channel Differential Imager for CHF Telescope
T/T Tip/Tilt
T/T/F Tip/Tilt/Focus
UCB University of California, Berkeley
UCLA University of California, Los Angeles
UCO UCO/Lick Observatory
UCSC University of California, Santa Cruz
UdeM Université de Montréal
USAF United States Air Force
VLT Very Large Telescope
WBS Work Breakdown Structure
WD White Dwarf
WFE WaveFront Error
WFS WaveFront Sensor
WIRCAM Wide-Field Infrared Camera