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Hicap

N-type semiconductor

Optical time-domain reflectometer

Over-the-horizon radar

Partial-response maximum-likelihood

Plain old telephone service

Gradient-domain image processing

Polywell

P-type semiconductor

Q-switching

Q factor

RAIKO (satellite)

Reliability, availability, maintainability and safety

RF connector

Serial Copy Management System

SINAD

SMPTE 259M

Silicon on insulator

Solid Edge

Substitution–permutation network