The only place to look for would be the SDK... and one of the .h files.
Marc Autret is the owner of IndiScripts.com. At some point I downloaded a newer version of the chart shown above, released in 2011 and titled "InDesign CS4/CS5" rather than just "CS4." It contains a few more characters and some corrections, AFAK.
Mike Witherell of JetSet Communications publishes InDesign character charts. His is more up to date than IndiScripts' above and includes many of the traditional metacharacters left out of IndiScripts (like ^p or end of paragraph used in InDesign's find/change): Adobe InDesign 2025 learning aids and helps and cheatsheets
I use both: with both of them, I can usually find what I need for all kinds of programming and automation with InDesign ... GREP, traditional Find/Change, automated publishing, HTML.
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