registry.scheme.org/hash-syntax.scm

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

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

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

(id "#'")
(description "Syntax datum [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]")

(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 "XML literal [SRFI 107]; Unreadable object [Gambit, Gauche]; import reader macro from this library [Sagittarius]")

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

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

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

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

(id "#[...]")
(description "Character set [Gauche]")

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

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