html special characters - SERP Analysis

https://www.html.am/reference/html-special-characters.cfm

https://www.w3schools.com/html/html_symbols.asp

https://www.php.net/manual/en/function.htmlspecialchars.php

https://developer.mozilla.org/en-US/docs/Glossary/Character_reference

https://webhelp.publichealth.jhu.edu/support/solutions/articles/6000086802-what-are-html-entities-special-characters-

https://hissa.nist.gov/~black/codesQuikRef.html

https://www.toptal.com/designers/htmlarrows/symbols/

https://www.w3schools.com/html/html_entities.asp

https://www.degraeve.com/reference/specialcharacters.php