The Kitáb-i-Aqdas
122.O Land of Ṭá   ¶91
“Ṭá” is the initial letter of Ṭihrán, the capital of Iran. Bahá’u’lláh has often chosen to represent certain place names by reference to their initial letter. According to the abjad system of reckoning, the numerical value of Ṭá is nine, which equals the numerical value of the name Bahá.