Consider the following generalization of the bicyclic monoid. Let be any infinite cardinal and let be the semigroup of all order isomorphisms between principal filters of the set with the product order. We shall study algebraic properties of the semigroup , show that it is bisimple, -unitary, -inverse semigroup, describe Green’s relations on , describe the group of units of the semigroup and describe its maximal subgroups. We prove that the semigroup is isomorphic to the semidirect product of the semigroup by the group , show that every non-identity congruence on the semigroup is a group congruence and describe the least group congruence on .

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