Look up Daniel Pinkwater and “The Hoboken Chicken Emergency” and “Looking for Bobowitz”. Sterling Matsoki (the mad scientist in both), was breeding square goldfish as part of an experiment to make fish that would be easier to transport in boxcars.
Maximum list (Victorian times). Quarter farthingThird farthingHalf farthingFarthingHa’pennyPenny1 1/2 PenceTuppenceThruppenceGroatSixpenceNinepenceShillingFlorinHalf CrownDouble FlorinCrownQuadruple FlorinDouble Crown/ Half SovereignSovereignGuinea (not minted, but used for accounts until the 1960’s) Double SovereignFive Sovereign
Ten and Twenty Pound pieces were planned but never issued (though patterns exist.)
Or things like Brie