AOR : Astronomical Observation Request
AOT : Astronomical Observation Template
CRE : Cryogenic Readout Electronics
DDCS : Double Differential Correlated Sampling (mode)
DMC : Detector and Mechanics Controller
DTCP : Daily TeleCommunications Period
ESA : European Space Agency
FM : Flight Model
FOV : Field-Of-View
FPU: Focal Plane Unit
FWHM : Full Width Half Maximum
HSpot: Herschel planning observations tool
ICC: Instrument Control Centre
ICS: Internal Calibration Source
ILT: Integrated (Instrument) Level Tests
NEP: Noise Equivalent Power
OD: Observation Day
PACS : Photodetector Array Camera & Spectrometer
QLA : Quick Look Analysis
QM: Qualification Model
RSRF: Relative Spectral Response Function
SED: Spectral Energy Distribution
SPU: Signal Processing Unit