The Motive Internet Glossary
natural language
Depending on how your site is hosted, mixing upper and lowercase letters in filename may break your links; stick to all lowercase and no punctuation (aside from hyphens) to be safe.
Natural language is using human-readable labels for file and folder names (based on the content they contain). For example; the files containing information on your organisation may be contained within a folder labeled about-us and named board.html and mission.html.
Adherence to this approach makes web administration and web log analysis a bit easier on the brain.
information architecture, label
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