Cataloguing - leaf cuttings from Holland. And an intergeneric hybrid, where two different but related genera (from within the same family) are crossed (these college lessons are paying off! 😝) - this means botanically you put an x before the resulting name. As it’s a cross between a species of Graptopetalum and a species of Echeveria, they called it ‘x Graptoveria’. This cultivar is called ‘Debbi’. All but one of the mother leaves have died already.
Indeed Alison! 😄 - you can also sometimes get an x between the genus and species names - this indicates that it is a interspecific hybrid (rather than an intergeneric hybrid) and so are are cross between two species within the same genus. A good example of that is Viburnum x bodnantense @bluefox23