Accuracy is the whole point of How To Type Any Symbol. Here is exactly how the codes and characters on this site are checked — and why you can trust the ones we publish.
Windows’ classic Alt+Numpad method only works for character codes in the range 0–255, because it reads from a legacy 256-character code page. A huge number of websites ignore this: they take a character’s decimal Unicode value (say 8734 for ∞) and print "Alt+8734", which does nothing on a normal PC. We never do that.
Each Windows Alt code is validated against the two real code pages Windows actually uses: Windows-1252 (the Alt+0nnn method) and Code Page 437 (the Alt+nnn method). A code is only published if the character it produces on a stock Windows machine matches the character on the page. Where no genuine Alt code exists, we say so honestly and point you to a method that does work — copy-paste, or Microsoft Word’s hex + Alt+X.
The whole site is regenerated from verified data by a build script, and a verification pass runs on every build: it re-checks all Alt codes against the code-page tables, confirms there are no duplicate or broken entries, validates every structured-data block, and checks that internal links resolve. If any check fails, the build is not shipped.
Emoji data follows the official Unicode names and code points. Keyboard shortcuts are the documented defaults for each operating system; where behaviour varies by device or manufacturer (common on Android and iPhone) we note the variation rather than assert a single answer. Found something wrong anyway? Please tell us — corrections are welcome and fixed quickly.