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Empty Characters, Whitespaces & Blank Unicode Characters
Whitespace character - Wikipedia
ASCII table - Table of ASCII codes, characters and symbols
White space characters - ASCII table
ASCII Table - ASCII codes, hex, decimal, binary, html - RapidTables.com
ASCII Table / character codes – SS64.com
Insert ASCII or Unicode Latin-based symbols and characters
Alt Code Shortcuts for Whitespace Characters – WebNots
Whitespace Characters — Copy & Paste Invisible Characters
Empty Character ⇒ Invisible Text