In communication terminology a "weak signal" refers to a signal that, respective to other signals and the circuit background noise, is difficult or impossible to distinguish. Weak Signal Research gathers information on ideas, trends and phenomena which do not fit an organization's current model or reality, and thus are usually filtered out. Often organizations are literally unable to perceive the new information, due to the strength of their established world view.

*MG Taylor Corporation Glossary
An Introduction to Management Center Theory and Practice version 2.0