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I and Q Channels = In-phase and Quadrature channels
I(Fd) = MTI Improvement Factor
I/A = Incident Analysis
I/C = In Charge
I/F = Interface
I/M = Inner Marker (ILS)
I/O = Input / Output
I/R = Interrogator/Responsor
I/R = Infra Red
I/S = Interference/Signal
I²SLS = Improved Interrogation Side Lobe Suppression
IA = Indirect Access
IA = International Alphabet
IA = Information Appliances
IA = Integration Activities
IA = [...]

IN = Information Need
IN = Inertial Navigation
IN = Intelligent Network
INA = Initial Approach
INA = Institut de la Navigation Aérienne (France)
Inbd = Inbound
INBO = Inbound
INC = Increased Nodal Capacity
INC = Inmarsat Navigation Centre
InCAS = Interactive Collision Avoidance Simulator
IND SIMUL = Individual Simulation
Ind = Industry
INF = Interactive Network Facility
Info = Information
INFR-C = Infrastructure Creation
INI = Initial [...]

IS = Intermediate System
IS = Interface Specification
IS = Infrastructure Services
IS = Intermediate Systems
IS = International Services
IS = International Standard
ISA = Industry Standard Architecture
ISA = Industry standard bus
ISA = Initial Scope Analysis
ISA = Instantaneous Self Assessment
ISA = International Standard Atmospheric Condition
ISA = Innovative Slot Allocation
ISA = Instantaneous Self-Assessment
ISA = International Standard Atmosphere
ISAKMP = Internet Secure Association [...]