The meaning of braces in various Schemes John Cowan 05 Sep 2012 06:24 UTC shows the meaning
of square brackets and curly braces in my Scheme test suite, which
currently includes 45 implementations.  Only Chibi and RScheme currently
do something special with braces; the other implementations treat them
as either synonyms for parentheses, lexical syntax errors, or identifier

A rose by any other name                            John Cowan
may smell as sweet,                       
but if you called it an onion             
you'd get cooks very confused.          --RMS