Dom
A right triangle whose legs are in the ratio 2:1 is sometimes known as a "dom," a name derived from "half a domino." The name was suggested by Andrew Clarke and preferred in an on-line ballot hosted by Livio Zucca.
A dom with leg lengths 1 and 2 has area 1.
It was later found that a double set of didoms will make a dodecagon. This led to the study of so-called domsliced polyforms.
See also
This entry contributed by Ed Pegg, Jr. (author's link)
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References
Pegg, E. Jr. http://www.mathpuzzle.com/dodeca.gif.
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Cite this as:
Pegg, Ed Jr. "Dom." From MathWorld--A Wolfram Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/Dom.html