[The following proposal for a new set of symbols for fundamental particles was agreed upon as a result of discussions held during the International Cosmic‐Ray Congress at Bagnères de Bigorre in the French Pyrenees, July 6–12, 1953. The Congress was organized by the University of Toulouse with the support of Unesco and of the Commission for Cosmic Rays of IUPAP. Co‐Authors of the present note are E. Amaldi, C. D. Anderson, P. M. S. Blackett, W. B. Fretter, L. Leprince‐Ringuet, B. Peters, C. F. Powell, G. D. Rochester, B. Rossi, and R. W. Thompson.]

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