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Numbers: Writing Numbers // Purdue Writing Lab
Although usage varies, most people spell out numbers that can be expressed in one or two words and use figures for numbers that are three or more words long.
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Numerical digit - Wikipedia
A numerical digit is a single symbol used alone (such as "2") or in combinations (such as "25"), to represent numbers in a positional numeral system. ... Numbers written from 0 to 9.
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Numbers, percentages, and dates | 18F Content Guide
We express these numbers with a numeral and a word. For example, 1.6 million people. ... For informal writing, it's okay to use an abbreviated form.
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