What is made up of 4 letters, still made up of 5, occasionally written with 12 letters and rarely with 6, but is written with 3 letters at none of the occasion
![Trick Mind Teaser Trick Mind Teaser](https://www.briddles.com/images/riddles/Trick-Mind-Teaser-997.jpg)
The statement is true.
What as 4 letters.
Still has 5 letters.
Occasionally has 12 letters.
Rarely has 6 letters.
But has 3 letters.