ΘΕΤΑ and ΘΗΤΑ
 

It has been mentioned on the talk page of the Wikipedia article about Delta Sigma Theta that the Delta Sigma Theta Coat of Arms spells out Theta as (ΘΕΤΑ) while the proper method of spelling it out is (ΘΗΤΑ). I'm looking for any *public* information as to why this is true. (The Epsilon is pronounced like the E in Bet, the Eta is pronounced like the ay in Bay)