Quote Originally Posted by ForestOwl
In FFVII Kjata's Tetra Disaster deals Fire/Ice/Lightning damage (3), but the Tetra Elemental absorbs Fire/Ice/Lightning/Earth damage (4). In the context of FFIX 'tetra' in Tetra Master refers to the number of cards in a hand, so it would be five. It would seem the definition of 'tetra' is up for debate.
Just something to add. According to the dictionary:

Four