The Greatest Name, or more fully, the calligraphy of the Greatest Name of God, is a calligraphized Arabic rendering of "Yá Bahá'ul 'Abhá" ("O Glory of the Most Glorious!"). It was original done by the eminent early Bahá'í calligrapher Mishkin Qalam, and later adopted by Bahá'ís everywhere.
It is generally considered to be the more reverent of the three symbols, therefore it is found in more distinguished places like paintings and art, rather than rings, t-shirts, and tattoos.