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 for logic variable
From The Free On-line Dictionary of Computing (30 December 2018) :

  logic variable
      A variable in a logic programming language
     which is initially undefined ("unbound") but may get bound to
     a value or another logic variable during unification of the
     containing clause with the current goal.  The value to which
     it is bound may contain other variables which may themselves
     be bound or unbound.
     For example, when unifying the clause
     	sad(X) :- computer(X, ibmpc).
     with the goal
     the variable X will become bound to the atom "billgates"
     yielding the new subgoal "computer(billgates, ibmpc)".

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