code
US /koʊd/
UK /koʊd/

1.
a system of words, letters, figures, or symbols used to represent others, especially for the purposes of secrecy or brevity
:
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The message was written in code.
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They used a secret code to communicate.
2.
a set of rules or principles or a set of laws or regulations
:
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The company has a strict dress code.
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The new building must comply with the fire safety code.
3.
instructions for a computer program
:
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He spent hours writing computer code.
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The programmer debugged the faulty code.
1.
2.
to write computer programs
:
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She learned to code in Python.
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Developers often code new features for software.