The **common logarithm** is the logarithm with base 10. It is also known as the **decadic logarithm** and also as the **decimal logarithm**, named after its base, or **Briggsian logarithm**, after Henry Briggs, an English mathematician who pioneered its use. It is indicated by log_{10}(*x*), or sometimes Log(*x*) with a capital *L* (however, this notation is ambiguous since it can also mean the complex natural logarithmic multi-valued function). On calculators it is usually "log", but mathematicians usually mean natural logarithm rather than common logarithm when they write "log". To mitigate this ambiguity the ISO specification is that log_{10}(*x*) should be lg (*x*) and log_{e}(*x*) should be ln (*x*).

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