or its engineering notation variant (for example 1, 10, 100, 1, etc.), or the computing variant E notation (for example 1e9, 1e10, 1e11, 1e12, etc.). This is the most common practice among scientists and mathematicians, and is both unambiguous and convenient. SI prefixes in combination with SI units, for example, giga for 109 and tera for 1012 can give gigawatt (=109 W) and terawatt (=1012 W). The International System of Units (SI) is independent of whichever scale is being used. Use with non-SI units (e.g. "giga-dollars", "megabucks") is possible. k€ and M€ is frequently encountered. See also Googol (number) Googolplex (number) Names of large numbers Names of small numbers Orders of magnitude (numbers) Hindu units of time which displays some similar issues Indian numbering system References External links BBC News article: "Is trillion the new billion?" Live-Counter.com: How to visualize large numbers:" Numerals Numeral systems