FromCharacterCode

FromCharacterCode[n] gives a string consisting of the character with integer code n. 

FromCharacterCode[{n1,n2,…}] gives a string consisting of the sequence of characters with codes ni. 

FromCharacterCode[{{n11,n12,…},{n21,…},…}] gives a list of strings. 

FromCharacterCode[codes,"encoding"] uses the specified character encoding. 

Please visit the official Wolfram Language Reference for more details and examples on core symbols.