Booleans

• type name

  Bool	Haskell, Perl6, Pliant
  bool	C#, C++, C99, F#, Go, OCaml, PHP, Python, SML, YAML
  Boolean	Ada, Lua, Pascal, Smalltalk, Visual Basic
  boolean	CoffeeScript, Common Lisp, Java, JavaScript, Maple, PHP, YCP
  BOOLEAN	Eiffel
  logic!	Rebol
  logical	Matlab

• false value

  false	Ada, BCPL, Beta, BourneShell, C#, C++, C99, CoffeeScript, E, F#, FL, Forth, Go, Io, Java, JavaScript, Logo, Lua, Maple, Matlab, OCaml, Oz, Pascal, PHP, Pliant, PostScript, Rebol, Ruby, Smalltalk, SML, Tcl, YAML, YCP
  False	Eiffel, Haskell, Mathematica, merd, Python, Visual Basic
  FALSE	Modula-3, SQL92
  false()	XPath
  #f	Dylan, Scheme
  n	YAML
  nil	Common Lisp, Emacs Lisp, Io, Lua, Ruby
  no	CoffeeScript, Tcl, YAML
  No	Prolog
  none	Rebol
  None	Python
  null	CoffeeScript, JavaScript
  NULL	C, C++, C99, PHP
  off	CoffeeScript, Tcl, YAML
  undef	Perl, Perl6
  undefined	CoffeeScript, JavaScript
  fail	Prolog
  FAIL	Maple
  array containing at least one false value	Matlab
  exit status different from 0	BourneShell
  0(1)	Awk, B, C, C++, C99, Classic REXX, CoffeeScript, Forth, JavaScript, Matlab, MUMPS, Perl, Perl6, PHP, Pike, Python, Tcl, Visual Basic, XPath, Yorick
  0.0	Matlab, Perl, PHP
  NaN	CoffeeScript, JavaScript, XPath
  ""	Awk, CoffeeScript, JavaScript, Perl, Perl6, PHP, Python, XPath
  "0"	Awk, Perl, Perl6, PHP
  ''	CoffeeScript, Matlab, Perl
  '\0'	C, C++, C99
  ()	Perl, Perl6, Python
  []	Matlab, Python
  {}	Matlab, Python
  array()	PHP

• true value

  TRUE	Modula-3, SQL92
  True	Eiffel, Haskell, Mathematica, merd, Python, Visual Basic
  true	Ada, BCPL, Beta, BourneShell, C#, C++, CoffeeScript, E, F#, FL, Forth, Go, Io, Java, JavaScript, Logo, Maple, OCaml, Oz, Pascal, PHP, Pliant, PostScript, Prolog, Rebol, Ruby, Smalltalk, SML, Tcl, YAML, YCP
  true()	XPath
  t	Common Lisp, Emacs Lisp
  #t	Dylan, Scheme
  y	YAML
  yes	CoffeeScript, Tcl, YAML
  Yes	Prolog
  on	CoffeeScript, Tcl, YAML
  exit status 0	BourneShell
  anything not false	Awk, B, C, C++, Common Lisp, Dylan, Emacs Lisp, Matlab, MUMPS, Perl, Perl6, Pike, Python, Rebol, Ruby, Scheme, XPath, Yorick
  1	Classic REXX, MUMPS
  non zero number	Tcl
  non-zero-numbers	Visual Basic
  -1	Forth

• logical not

  !	Awk, B, C, C#, C++, CoffeeScript, E, Go, Java, JavaScript, Mathematica, Perl, Perl6, PHP, Pike, Ruby, Tcl, Vimscript, YCP, Yorick
  not(2)	Ada, Beta, CoffeeScript, Common Lisp, Eiffel, Emacs Lisp, F#, Haskell, Io, Logo, Lua, Maple, merd, OCaml, Pascal, Perl, Perl6, Pliant, PostScript, Prolog, Python, Rebol, Ruby, Scheme, Smalltalk, SML, XPath
  Not	Oz, Visual Basic
  NOT	Modula-3
  ~	BCPL, Dylan, Matlab, PL/I
  ^	PL/I
  '	MUMPS
  \	Classic REXX
  =0	Forth

• logical or / and

  short circuit

  || / &&	Awk, C, C#, C++, CoffeeScript, E, F#, Go, Haskell, Java, JavaScript, Mathematica, Matlab, merd, OCaml, Perl, Perl6, PHP, Pike, Ruby, Tcl, Vimscript, YCP, Yorick
  | / &	B, BCPL, Dylan
  or / and	CoffeeScript, Common Lisp, Emacs Lisp, Io, Logo, Lua, Modula-2, Perl, Perl6, PHP, Pliant, Python, Ruby, Scheme, Smalltalk
  OR / AND	Modula-3
  or / &(3)	Modula-2
  any / all	Rebol
  orelse / andalso	SML
  orelse / andthen	Oz
  or else / and then	Ada, Eiffel
  ; / ,	Prolog
  & / !	MUMPS

  non short circuit (always evaluates both arguments)

  | / &	C#, Classic REXX, Java, Matlab, Smalltalk
  or / and	Ada, Beta, Eiffel, Maple, Pascal, PostScript, Rebol, SML, XPath
  Or / And(4)	Oz, Visual Basic
  \/ / /\(5)	BCPL
  ?| /	Perl6

Remarks

• (1) beware of 0.0 which is true in Pike!
• (2) Smalltalk: postfix operator
• (3) in Modula-2, "&" and "and" are synonyms
• (4) in Oz, simple functions, not operators
• (5) ascii representation, original uses a special charset