Unicode characters from Julia website

Question

In this link https://docs.julialang.org/en/v1/manual/unicode-input/ there is a list where you can directly use the unicode symbols:
Code point(s);    Character(s);   Tab completion sequence(s); Unicode name(s)
The Tab completion sequence(s) have also a name for direct command and Code point(s). I have seen that exist also emoji package and similar.
I have this MWE that it is not works:
documentclass[a4paper,12pt]{article}
usepackage{fontspec}

begin{document}
? %%%%%%%%%%%%%%%%%%%%<-----"anguria"
end{document}

My question is:
How is it possible to use the symbols directly with the command or directly by copying them, either in text mode or in math mode??

Davislor · Answer

In text mode, load a font that contains the characters.  You should also put the command tracinglostchars=2 in your source file, so TeX will warn you if your current font lacks a character.
If you want to load a symbol from a font other than your main font, you can set the Unicode character active.  For example, let’s say you want to use the “tombstone” symbol ∎ for end-of-proof, as in some editions of DEK’s The Art of Computer Programming, and you want to use it from XITS.  You could write,
usepackage{fontspec}
usepackage{newunicodechar}

newfontfamilysymbolfont{XITS}[Scale=MatchUppercase]
DeclareRobustCommand{qedqymbol}{{symbolfontsymbol{"220E}}}
newunicodechar{^^^^220e}{qedsymbol}

In math mode, you are limited to the characters listed in The List of Characters Defined by unicode-math, but you can set the font used for any of them with setmathfont[range=....  As with the previous example, you can set
setmathfont{XITS Math}[Scale=MatchUppercase,range="220E]

This lets you type either QED or ∎ in math mode.  You can also use textnormal{...} in math mode to use any text-mode symbol.

Unicode characters from Julia website

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