The question is: «Does Spain have a heraldic badge similar to how the British Isles have heraldic badges? I’ve found nothing so far for Spain except the Yoke and Arrows from the Catholic Monarchs»
Spain does not have badges, national insignias, equivalent to the badges of the British Isles, and this is not an absence or a gap, but rather the result of a different historical tradition.
In England and in the Anglo-British world, the badge developed as a personal and later territorial symbol, detached from the full coat of arms and easily reproducible. In the Hispanic Monarchy, by contrast, symbolic weight almost always rested on the coat of arms and on standards, not on simplified badges.
That said, if we accept badges in a functional sense, as a simple symbol that immediately refers to Spain, then the following can be stated:
Other possibilities that come to mind are the Order of the Golden Fleece and the Cross of Santiago, both associated with their respective orders of chivalry, which could also function as a badge ~ «insignia». If one had to choose between them, I would undoubtedly choose the Cross of Santiago.
In summary:
Atom, Crescent, Diamond, Emerald, Estoile, Increscent, Lightning flash, Moon, Mount, Mullet, Mullet of four points, Orbital, Plough of Ursa Major, Rainbow, Ray of the sun, River, Sea, Snowflake, Sun, Sun in splendour, Sun of May, Trimount, Water and Wave.
Acorn, Apple, Apple tree, Ash, Bluebonnet, Camellia, Chrysanthemum, Cinquefoil, Cornflower, Dogwood flower, Double rose, Elm, Fleur de lis, Flower, Gourd, Holm oak, Hop cone, Indian paintbrush, Kapok tree, Laurel, Lily, Linden, Lotus flower, Madonna lily, Mexican cedar tree, Oak, Olive tree, Palm tree, Plantain plant, Pomegranate, Poplar leaf, Rose, Shamrock, Sunflower, Thistle, Tree, Tulip, Vine and Wheat.
Badger, Bald eagle, Barbel, Barn owl, Bear, Beaver, Bee, Beetle, Bighorn sheep, Binson, Blackbird, Boar, Brach hound, Bull, Doe, Dog, Dolphin, Dove, Eagle, Elephant, Falcon, Female figure, Fish, Flame, Fly, Fox, Frog, Goat, Goldfinch, Goose, Heron, Horse, Hummingbird, Jaguar, Lark, Leopard, Lion, Lion passant, Lion rampant guardant, Lioness, Lynx, Male figure, Martlet, Merino ram, Owl, Panther, Parrot, Peacock, Pelican, Pelican in her piety, Pronghorn, Puffin, Quetzal, Raven, Roe deer, Rooster, Savage, Seagull, Serpent, She-wolf, Stag, Starling, Talbot, Turtle, Tyger, Vulture, Warren hound and Wolf.
Arm, Beak, Branch, Caboshed, Chest, Claw, Covert, Dorsal fin, Eagle claw, Ear of wheat, Ermine spot, Escallop, Feather, Foot (palmiped), Foreleg, Forepaw, Hand, Head, Heart, Hoof, Leaf, Neck, Ostrich feather, Palm frond, Paw, Roe deers' attires, Shoulder, Sprig, Stags' attires, Stem, Swallow-tail, Tail, Tail addorsed, Tail fin, Talon, Tibia, Tooth, Trunk, Trunk (elephant), Two hands clasped, Two wings in vol, Udder, Wing and Wrist.
Ace of spades, Anchor, Anvil, Arch, Arm vambraced, Armillary sphere, Arrow, Axe, Bell, Bell tower, Beret, Bonfire, Book, Bookmark, Bow, Branding iron, Bridge, Broken, Buckle, Cannon, Cannon dismounted, Cannon port, Canopy roof, Carbuncle, Castle, Celtic Trinity knot, Chain, Chess rooks, Church, Clarion, Clay pot, Closed book, Club, Column, Comb, Compass rose, Conductor's baton, Cord, Covered cup, Crozier, Crucible, Cuffed, Cup, Cyclamor, Dagger, Double vajra, Drum, Ecclesiastical cap, Fanon, Federschwert, Fleam, Four crescents joined millsailwise, Galician granary, Garb, Gauntlet, Geometric solid, Grenade, Halberd, Hammer, Harp, Host, Hourglass, Key, Key ward, Knight, Knot, Lantern, Letter, Line, Loincloth, Menorah, Millrind, Millstone, Millwheel, Monstrance, Mortar, Mullet of six points pierced, Nail, Non-classic artifact, Norman ship, Number, Oar, Oil lamp, Open book, Page, Pair of scales, Parchment, Pestle, Piano, Pilgrim's staff, Plough share, Polish winged hussar, Port, Portcullis, Potent, Quill, Ribbon, Rosette of acanthus leaves, Sabre, Sackbut, Sail, Scroll, Scythe, Sheaf of tobacco, Ship, Skirt, Spear, Spear's head, Stairway, Star of David, Step, Sword, Symbol, Tetrahedron, Torch, Tower, Trident, Trumpet, Turret, Two-handed sword, Wagon-wheel, Water-bouget, Wheel, Winnowing fan and With a turret.
Angel, Archangel, Basilisk, Dragon, Dragon's head, Garuda, Golden fleece, Griffin, Heart enflamed, Justice, Mermaid, Our Lady of Mercy, Ouroboros, Paschal lamb, Pegasus, Phoenix, Sacred Heart of Jesus, Saint George, Sea-griffin, Trinity, Triton, Unicorn, Winged hand and Wyvern.
Dr. Antonio Salmerón y Cabañas,
,
Paseo de la Castellana 135,
7th floor,
28046 Madrid, Spain.