I guess you mean the place value column to the left of a trillion: ten trillion.
http://wiki.answers.com/Q/What_place_value_comes_a...

The order is: million, billion, trillion, quadrillion, quintillion,
http://www.chacha.com/question/whatplacevalueco...

After trillion, there comes quadrillion! That's fifteen zeros. After quadrillion, it's quintillion.
http://www.kgbanswers.com/whatcomesaftertrillio...

million. billion. trillion. quadrillion. quintillion. hexillion. heptillion. octillion.
http://answers.yahoo.com/question/index?qid=201103...
