n.

any communication that encodes a message

"signals from the boat suddenly stopped"

同義詞：signalingsign

any incitement to action

"he awaited the signal to start"; "the victory was a signal for wild celebration"

an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes

Blind Beamforming for non Gaussian Signals
Channel coding with multilevel/phase signals
On the Energy Detection of Unknown Signals Over Fading Channels
G proteins: transducers of receptor-generated signals
The involvement of cell-to-cell signals in the development of a bacterial biofilm.
Introduction to random signals and applied Kalman filtering : with MATLAB exercises and solutions
Replication of Genome-Wide Association Signals in UK Samples Reveals Risk Loci for Type 2 Diabetes
A human homologue of the Drosophila Toll protein signals activation of adaptive immunity.
Skills, rules, and knowledge; signals, signs, and symbols, and other distinctions in human performance models
Epigenetic regulation of gene expression: how the genome integrates intrinsic and environmental signals.