What does ER stand for?

MLA style: "ER." Acronym Finder . 2012. AcronymFinder.com 29 May. 2012 http://www.acronymfinder.com/Echo-Ranging-(ER).html
Chicago style: Acronym Finder . S.v. "ER." Retrieved May 29 2012 from http://www.acronymfinder.com/Echo-Ranging-(ER).html
APA style: ER. (n.d.) Acronym Finder. (2012). Retrieved May 29 2012 from http://www.acronymfinder.com/Echo-Ranging-(ER).html

Echo Ranging

This definition appears very rarely and is found in the following Acronym Finder categories:

Military and Government

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Samples in periodicals archive:

The specialists at the gathering, Weir writes, "concluded that underwater sound and echo ranging offered the most promising avenue of exploration for ASW scientists in the war effort.

An Ocean in Common: American Naval Officers, Scientists, and the ...