Table 22-4: Standard # Macro Character Syntax
#! undefined * #<backspace> signals error
#" undefined #<tab> signals error
## reference to #= label #<newline> signals error
#$ undefined #<linefeed> signals error
#% undefined #<page> signals error
#& undefined #<return> signals error
#' function abbreviation #<space> signals error
#( simple vector #+ read-time conditional
#) signals error #- read-time conditional
#* bit-vector #. read-time evaluation
#, load-time evaluation #/ undefined
#0 used for infix arguments #A, #a array
#1 used for infix arguments #B, #b binary rational
#2 used for infix arguments #C, #c complex number
#3 used for infix arguments #D, #d undefined
#4 used for infix arguments #E, #e undefined
#5 used for infix arguments #F, #f undefined
#6 used for infix arguments #G, #g undefined
#7 used for infix arguments #H, #h undefined
#8 used for infix arguments #I, #i undefined
#9 used for infix arguments #J, #j undefined
#: uninterned symbol #K, #k undefined
#; undefined #L, #l undefined
#< signals error #M, #m undefined
#= label following object #N, #n undefined
#> undefined #O, #o octal rational
#? undefined * #P, #p pathname
#@ undefined #Q, #q undefined
#[ undefined * #R, #r radix-n rational
#\ character object #S, #s structure
#] undefined * #T, #t undefined
#^ undefined #U, #u undefined
#_ undefined #V, #v undefined
#` undefined #W, #w undefined
#{ undefined * #X, #x hexadecimal rational
#| balanced comment #Y, #y undefined
#} undefined * #Z, #z undefined
#~ undefined #<rubout> undefined
|