number riddle

Not sure that I even understand the question so, my guess is: Four
Edit to add this: ...or 4

Hi, no i don't understand it either, but i was hoping someone might !!!

My reasoning is that it is the only number I am aware of that the number of letters refer to the number itself. For example:

one=1 (3 letters)
two=2 (3 letters)
three=3 (5 letters)
four=4 (4 letters)

I hope that makes sense. Maybe the other riddle people know the answer since I am only guessing.

Hi, yes i can see your reasoning on that, thanks, maybe someone will come up with something else!!

I Googled your riddle and found this:

55. The only one with a number credited to all four. What number? ONE VISION

I don't get it mark

I was even thinking it had something to do with the 3 musketeers and the saying "All for one and one for all"