The following entries should be added/completed:

#` quasisyntax [R6RS]; [syntax-case]
#, unsyntax [R6RS]; [syntax-case]
#,@ unsyntax-splicing [R6RS]; [syntax-case]

#| Block comment until |# [R6RS]; [R7RS]
#; S-expression comment [R6RS]; [R7RS]

#<n>= Datum label [R7RS]
#<n># Datum reference [R7RS]

#: Keyword arguments [Racket]; [Guile]; [???]