((id "#<n>")
 (description "Object by serial number [Chicken, Gambit]"))

((id "#!")
 (description "Identifier follows [R6RS+]; Unix script [SRFI 22]; #! ... !# comment [Guile]"))

((id "#\"...\"")
 (description "Interpolated string [Gauche]"))

((id "#{...}")
 (description "Gensym [Chez Scheme]"))

((id "#${...}")
 (description "Binary blob [Chicken]"))

((id "#&")
 (description "Box ['Chez, 'Gambit, Racket]"))

((id "#'")
 (description "syntax [R6RS, syntax-case]"))

((id "#(...)")
 (description "Vector [R7RS]"))

((id "#*\"...\"")
 (description "Incomplete string [Gauche]"))

((id "#+")
 (description "Read-time conditional [Chicken]"))

((id "#,")
 (description "unsyntax [R6RS, syntax-case]; Reader constructor [SRFI 10]"))

((id "#,@")
 (description "unsyntax-splicing [R6RS, syntax-case]"))

((id "#/.../")
 (description "Regular expression [Gauche, Kawa, LIPS]"))

((id "#:")
 (description "Keyword object [Chicken, Guile, s7]; Keyword marker [Kawa, Racket]; Uninterned symbol [Gauche]"))

((id "#;")
 (description "S-expression comment [R6RS, R7RS, SRFI 62]"))

((id "#<...>")
 (description "Unreadable object [Chez Scheme, Chibi-Scheme, Chicken, Gambit, Gauche, Kawa, Mosh, Sagittarius]; XML literal [SRFI 107]; import reader macro from this library [Sagittarius]"))

((id "#<<")
 (description "Multi-line string literal [Chicken, Gambit]"))

((id "#<n>#")
 (description "Datum reference [R7RS]"))

((id "#<n>=")
 (description "Datum label [R7RS]"))

((id "#?")
 (description "Debug macro [Gauche]"))

((id "#[...]")
 (description "Character set [Gauche], Record [Chez Scheme]"))

((id "#\\")
 (description "Literal character [R2RS+]"))

((id "#`")
 (description "quasisyntax [R6RS, syntax-case]; legacy interpolated string [Gauche]"))

((id "#|...|#")
 (description "Block comment [R6RS, R7RS, SRFI 30]"))

((id "#a")
 (description "Array [SRFI 58, SRFI 163]"))

((id "#b")
 (description "Binary integer [R2RS+]"))

((id "#c<n>(...)")
 (description "n-bit complex vector [SRFI 160: n = 64, 128]"))

((id "#ci")
 (description "Change to case insensitive identifiers [Chicken]"))

((id "#cs")
 (description "Change to case sensitive identifiers [Chicken]"))

((id "#<n>d(...)")
 (description "n-dimensional array [s7]"))

((id "#d")
 (description "Decimal number [R2RS+]"))

((id "#e")
 (description "Exact number [R2RS+]"))

((id "#f")
 (description "Boolean false [R3RS+]"))

((id "#f<n>(...)")
 (description "n-bit float vector [SRFI 4, 160: n = 32, 64]"))

((id "#false")
 (description "Boolean false [R7RS]"))

((id "#<n>i(...)")
 (description "n-dimensional signed integer array [s7]"))

((id "#i")
 (description "Inexact number [R2RS+]"))

((id "#i<n>d(...)")
 (description "n-dimensional signed integer array [s7]"))

((id "#lang")
 (description "Declare which programming language is used [Racket]"))

((id "#o")
 (description "Octal integer [R2RS+]"))

((id "#<n>r")
 (description "Number in radix n [Chez Scheme]"))

((id "#<n>r(...)")
 (description "n-dimensional real (i.e. float) array [s7]"))

((id "#r<n>d(...)")
 (description "n-dimensional real (i.e. float) array [s7]"))

((id "#s<n>(...)")
 (description "n-bit signed integer vector [SRFI 4, 160: n = 8, 16, 32, 64]"))

((id "#t")
 (description "Boolean true [R3RS+]"))

((id "#true")
 (description "Boolean true [R7RS]"))

((id "#<n>u(...)")
 (description "n-dimensional byte array [s7]"))

((id "#u<n>(...)")
 (description "n-bit unsigned integer vector [SRFI 4, 160: n = 8, 16, 32, 64]"))

((id "#u<n>d(...)")
 (description "n-dimensional byte array [s7]"))

((id "#u8(...)")
 (description "Bytevector [R7RS]"))

((id "#u8\"...\"")
 (description "String-notated bytevector [SRFI 207]"))

((id "#vfx(...)")
 (description "Fixnum vector aka fxvector [Chez Scheme]"))

((id "#vu8(...)")
 (description "Bytevector [R6RS]"))

((id "#x")
 (description "Hexadecimal integer [R2RS+]"))