What does Hind and ‘III’ refer to in the enzyme Hind III?

What does Hind and ‘III’ refer to in the enzyme Hind III?

(i) The first letter ‘H -indicates the genus of the organism, from which the enzyme was isolated, i.e. H-genus, Haemophilus.
(ii) The roman number (III) denotes the sequence in which the restriction endonuclease from that particular genus, species and strain of bacteria have been isolated, i.e. third restriction endonuclease to be isolated from this species.