I thought of this post whilst reading through 'By my sword and shield' by E. Jaiwant Paul today.
Page 84 may have the answer:
"Sometimes a battle axe was combined with a zaghnol and wascalled a tabar-zaghnol. It was double-headed, the broad blade on one side and the pointed one on the other. The shaft of the battle axe generally measured 90 to 120 centimetres and the head of the axe five to six inches measured vertically"
Hope this helps!