This is the commonly used abbreviation for the exposure concentration of a toxicant causing a defined effect on n% of a test population.
Electronic Communications Network. Defined under Rule 11Ac1- 1(a)(8) under the U.S. Securities Exchange Act of 1934.See: Emerging company marketplace
abbreviation: Enroute Change Notice
Emergency Communications Network
Eye Cancer Network
<abbreviation> This is the commonly used abbreviation for the exposure concentration of a poisonous substance causing a defined effect on n% of a test population, for instance, the EC50 would affect 50% of the population. ... (09 Oct 1997) ... 
Electronic Communications Network
Engineering Change Notice.
This is the commonly used abbreviation for the exposure concentration of a toxicant causing a defined effect on n% of a test population.
Median effective concentration to n% of a population
acronym: Environmental Change Networkacronym: Netherlands Energy Research Foundation
European Chemical News - Trade Journal
See electronic communication network (ECN)