From type/Str

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sub    uniparse(Str:D $names  --> Str:D)
method uniparse(Str:D $names: --> Str:D)

Takes string with comma-separated Unicode names of characters and returns a string composed of those characters. Will Fails if any of the characters' names are empty or not recognized. Whitespace around character names is ignored.

say "I {uniparse 'TWO HEARTS'} Raku"; # OUTPUT: «I 💕 Raku␤» 
'TWO HEARTS, BUTTERFLY'.uniparse.say; # OUTPUT: «💕🦋␤»

Note that unlike \c[...] construct available in string interpolation, uniparse does not accept decimal numerical values. Use chr routine to convert those:

say "\c[1337]"; # OUTPUT: «Թ␤» 
say '1337'.chr; # OUTPUT: «Թ␤»

Note: before being standardized in 2017.12, this routine was known under its working name of parse-names. This denomination will be removed in the 6.e version.