'it is triple' is a correct and usable phrase in written English.
You can use it when you want to emphasize the number three, or to describe something that has been multiplied or increased threefold. For example, you could say, "The landlord raised the rent - it is triple what it used to be!".
It is triple platinum and still rests, impressively, at No. 31 on the Billboard 200.
Today, it is triple that amount, having increased twice as fast as other neighbourhoods in Rio (and about five times faster than London in the same period).
When it is put aboard on the other side, it is triple checked, and over here the ship's purser, the bank representatives, and armored car men all stand around and hand receipts to each other until the ships responsibility is ended.
It is Triple Crown season.
It is triple hard for Cubans because they usually come here through political channels and have to renounce their country and leave their families behind ($50 million contracts seem to ease the pain a little, though, a far cry from earlier days when Latino players were segregated to separate hotels in each city they visited).
It is triple-smoked, which gives a haunting char to its flavor and results in a moist, lush texture.
So it is tripling the number of virtual goods it is selling, but not the dollar amount.
It was triple overtime, and then you broke 'em down.
And not only is it happy, it's triple happy: Chuck E. Cheese, you can't say each one of those without smiling.
For 17-year-old drivers, the risk increase was even larger; with three or more passengers it was triple the risk of driving alone.
Our best hope for kickass, warrior women in 2016 may lie with The Huntsman: Winter's War and it's triple whammy of mighty actresses.
