What comes after the English word depends on the specific usage: trillion: noun: [number] trillion; numeral: [number] trillion; adjective: trillion. Billion: noun: one billion; a large amount; numeral: one billion; adjective: one billion. million:. The most direct notation is that there are 6 zeros after one million, and 9 zeros after one billion (from a high school classmate), but because the two words only differ by one letter, it is easy to confuse, and billion can be associated with the very rich Bill Gates.
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