Asteroid 21423, Credo, was discovered on March 24, 1998 by MIT Lincoln Laboratory's Near-Earth Asteroid Research (LINEAR) program at Socorro, New Mexico. It has a period of 3 years, 276 days.
It was named for Highland Park, Illinois high-school student Timothy Frank Credo (born 1987), who entered an engineering project in the 2005 Intel Science Talent Search, attaining the finals.
Astrologically, asteroid Credo has been linked to beliefs, to believe, what one believes, dogma.
The glyph for Credo is mine.