Answer:
There are several symbols used in the Baha'i Faith. Baha'is probably most often use a nine-pointed star or floret. In Arabic and Persian, among other languages, letters can stand for numbers. The number 9 is the numeric equivalent of the word "Baha" (signifying glory, light, or splendor). Baha'u'llah is the name of the founder of the Baha'i Faith, Whom Baha'is regard as the Manifestation of God for this dispensation. Nine is also the highest single digit, representing wholeness or unity. Baha'i councils currently have nine members and Baha'i Houses of Worship have nine sides.
Additional symbols include: the 5-pointed star, representing the Manifestations of God; the number 19 and 19-pointed stars, standing for the word "Wahid" meaning unity, as well as symbolically standing for the mystical meanings contained in the opening verse of the Qur'an, which has 19 letters. There are also two forms of the "Greatest Name" (the word Baha). One is a calligraphic representation of the phrase "Ya Baha'u'l-Abha" (O Thou Glory of the Most Glorious!); the other is called the ringstone symbol and includes the letters B and H in Arabic, stylistically organized to represent the world of God, the world of the Manifestations, and the world of humanity, with a vertical line representing the Holy Spirit descending from God through the Manifestations to humankind; on either side of this symbol is a five pointed star, representing the two Manifestations of God for this era, the Bab ("Gate", 1819-1850, the forerunner of Baha'u'llah), and Baha'u'llah ("Glory of God", 1817-1892, the Founder of the Baha'i Faith).