The logo of the XXI ICPEAC 1999 in Sendai is based on one of the family crests of the Date (pronounced "dahtei") clan who ruled over the present Miyagi Prefecture and beyond from the 16th century till the Meiji Restoration. The nine spheres called "KU-YOH" symbolize auspicious heavenly bodies such as the sun, the moon, planets and stars as well as the mythological nine Gods who are guardians of Heaven and Earth. To physicists' eyes the nine spheres might resemble the electronic clouds of the filled L-shell around the inner core of an atom/ion. Originally conceived by Professor Y. Sato of the Tohoku University, it underwent some artistic touches at Tokyo Studio Co. Ltd.

(Final digitization by S. W.)