January 11

The 9-pointed star is not a part of the teachings of our Faith, but only used as an emblem representing "9".... Strictly speaking the 5-pointed star is the symbol of our Faith..… 
(From a letter dated 28 October 1949, written on behalf of Shoghi Effendi to an individual believer; Baha’i News, no. 228, February 1950); compilation: Lights of Guidance; also included in a memorandum by the Research Department of the Universal House of Justice, dated 24 January 1999)