Also known as URL encoding, percent escape, URL escape code, percent escape code
Percent-encoding, also known as URL encoding, is a method to encode arbitrary data in a uniform resource identifier (URI) using only the US-ASCII characters legal within a URI. Percent-encoding is used to ensure special characters do not interfere with the URI's structure and interpretation. Special characters are replaced with a percent sign (%) followed by two hexadecimal digits representing the character's byte value. For example, a space is commonly encoded as %20:
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).