Inspired by this 11-letter word puzzle, another one goes below:
An 11-letter word for denoting something very ancient to us.
1-2-3 letters: used for denoting what occurs three times, be it a championship or a geometric shape.
3-4-5 letters: what the White Witch, Sub-Zero and queen Elsa have in common?
6-7-8 letters: not a little mouse, that one. It should avoid the Vietnamese cuisine, though.
9-10-11 letters: a fertility deity, but also commonly adopted by military.
What am I?