Keyword -- the class of all keywords

Methods that use a keyword :

• ? Keyword -- see ? Symbol -- view brief documentation of a symbol
• dictionary(Keyword) -- see dictionary -- determine the dictionary to which a symbol belongs

Fixed objects of class Keyword :

• ! -- factorial
• != -- inequality
• # -- length or access to elements
• #? -- check existence of value in a list, hash table, database, or string
• % -- a binary operator, usually used for remainder and reduction
• %= -- augmented assignment for %
• & -- a binary operator
• &= -- augmented assignment for &
• (*) -- a unary postfix operator, used for indicating a graded object
• * -- a binary operator, usually used for multiplication
• ** -- a binary operator, usually used for tensor product or Cartesian product
• **= -- augmented assignment for **
• *= -- augmented assignment for *
• + -- a unary or binary operator, usually used for addition
• ++ -- a binary operator, usually used for direct sum
• ++= -- augmented assignment for ++
• += -- augmented assignment for +
• , -- the comma, used for separating entries in a list or sequence
• - -- a unary or binary operator, usually used for negation or subtraction
• -= -- augmented assignment for -
• -> -- make a function
• . -- access to elements whose key is a symbol
• .. -- a binary operator, used for sequences of consecutive items
• ..< -- a binary operator, used for sequences of consecutive items, not including the endpoint
• ..<= -- augmented assignment for ..<
• ..= -- augmented assignment for ..
• .? -- check for presence of elements whose key is a symbol
• / -- a binary operator, usually used for division
• // -- a binary operator, usually used for quotient
• //= -- augmented assignment for //
• /= -- augmented assignment for /
• : -- a binary operator, uses include repetition; ideal quotients
• := -- assignment of method or new local variable
• ; -- expression separator
• < -- less than
• <- -- assignment with left side evaluated
• << -- a binary operator (file output, ...)
• <<= -- augmented assignment for <<
• <= -- less than or equal
• <== -- a unary and binary operator
• <=== -- a unary and binary operator
• <==> -- a binary operator
• <==>= -- augmented assignment for <==>
• = -- assignment
• =!= -- strict inequality
• == -- equality
• ===> -- a binary operator
• ===>= -- augmented assignment for ===>
• ==> -- a binary operator
• ==>= -- augmented assignment for ==>
• => -- produce an Option
• > -- greater than
• >= -- greater than or equal
• >> -- a binary operator, uses include bit shifting, or attaching optional inputs to functions
• >>= -- augmented assignment for >>
• ? -- comparison operator
• ?? -- null coalescing operator
• ??= -- augmented assignment for ??
• @ -- a binary operator
• @= -- augmented assignment for @
• @@ -- a binary operator
• @@= -- augmented assignment for @@
• \ -- a binary operator
• \= -- augmented assignment for \
• \\ -- a binary operator
• \\= -- augmented assignment for \\
• ^ -- a binary operator, usually used for powers
• ^* -- a unary postfix operator, used for indicating pullback maps
• ^** -- a binary operator, usually used for tensor or Cartesian power
• ^**= -- augmented assignment for ^**
• ^= -- augmented assignment for ^
• ^^ -- logical exclusive-or
• ^^= -- augmented assignment for ^^
• _ -- a binary operator, used for subscripting and access to elements
• _* -- a unary postfix operator, used for indicating pushforward maps
• _= -- augmented assignment for _
• | -- a binary operator, often used for horizontal concatenation
• |- -- a binary operator
• |-= -- augmented assignment for |-
• |= -- augmented assignment for |
• || -- a binary operator, often used for vertical concatenation
• ||= -- augmented assignment for ||
• ~ -- a unary postfix operator
• and -- conjunction
• break -- break from a loop
• catch -- catch a thrown exception
• continue -- continue with the next iteration of a loop
• do -- loop control
• elapsedTime -- time a computation using time elapsed
• elapsedTiming -- time a computation using time elapsed
• else -- condition testing
• for -- for loops
• from -- loop control
• global -- get a global symbol
• if -- condition testing
• in -- a keyword used in for-loops
• list -- loop control
• local -- get a local symbol
• new -- new objects and new types
• not -- negation
• of -- a keyword
• or -- disjunction
• return -- return from a function
• shield -- shield evaluation from interrupts
• SPACE -- blank operator; often used for function application, making polynomial rings
• step -- step by single lines in the debugger
• symbol -- get a symbol
• then -- condition testing
• === -- see Thing === Thing -- strict equality
• threadVariable -- create a symbol whose value in one thread is not shared with others
• throw -- throw an exception
• time -- time a computation
• timing -- time a computation
• to -- loop control
• try -- catch an error
• when -- a keyword
• while -- while loops
• xor -- exclusive disjunction

For the programmer

The object Keyword is a type, with ancestor classes Symbol < Thing.