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Dozenal Society of America
Promoting base twelve and alternative base mathematics
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The Dozenal Society of America
The DSA is a voluntary, nonprofit education corporation, organized for the conduct of research and education of the public in the use of dozenal (also called duodecimal or base-twelve) in calculations, mathematics, weights and measures, and other branches of pure and applied science.

Officers and Board Members

OFFICERS
BOARD CHAIR
Jay Schiffman
PRESIDENT VICE PRESIDENT
Graham Steele John Volan
SECRETARY TREASURER
Michael deVlieger Jay Schiffman
EDITOR OF THE BULLETIN
John Volan
BOARD OF DIRECTORS
Dean Canfield, Virginia Michael De Vlieger, St. Louis, Missouri
John Impagliazzo, Long Island, New York Paul Rapaport, Hamilton, Ontario
Jay Schiffman, Philadelphia, Pennsylvania Graham Steele, St Petersburg, Florida
Timothy Travis, Fayetteville, North Carolina John Volan, Ashland, Massachusetts
© 11E9-1209 (decimal 2013-2025). The Dozenal Society of America. Contact Us
Creative Commons License
This website and the documents on it are licensed under a Creative Commons Attribution 3.0 Unported License.
Numeration on this site is in dozenal (also called duodecimal, or base twelve), using "X" for ten and "E" for eleven.
0 1 2 3 4 5 6 7 8 9 X E 10 11 12 13 14 15 16 17 18 19 1X 1E 20 21 22...
PDF documents may use a Dwiggins stylized "X" and "E" or the Pitman inverted "2" and "3".
The Humphrey point, or semicolon, is used for fractional parts; e.g., "0;6 = 0.5."