考研西医专业：无法想象，这门学科到底有多难？
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This is only a draft. Feel free to edit it.
Function
A function is notable if it meets one of the following criteria:
- It is used (i.e. invoked) in at least one Wikimedia page (except sandboxes and connected implementations or test cases).
- It is described in at least one reliable source.
- It is included in an official (built-in), semi-official (such as PEAR), or widely used third-party library of a notable programming language.
- "widely used" is currently not clearly defined.