What Is a SIC Code? Standard Industrial Classification (SIC) codes are four-digit numerical codes used to categorize U.S. companies by the industries in which they operate. Companies are required ...

Activity codes are optional four digit numerical codes in FAS that may be used to define the activities of a unit in more detail than is available through the account codes.

These hidden numerical codes can be used to change or check the settings on your iPhone.

A personal identification number (PIN) is a numerical code used in many electronic financial transactions, providing additional account security.

Pro tip: You can also use the Custom Numeric Code option to set a long all-number code. This may be a bit less secure but more convenient. Plus, you still get the use the easy numerical keypad.

Precision cosmology: the Large Synoptic Survey Telescope will soon be scanning the heavens. (Courtesy: LSST) A powerful numerical code that uses Einstein’s general theory of relativity to describe how ...