Symbolism: death and regeneration, transformation, end of old projects, new beginnings, return, change, rest, success, plenty, knowledge
Symbols: skulls, bats, cats, leaves, nuts, seeds, barren trees and branches, pumpkins, cauldron, pentacle, crystal ball, besom or broom, witch's hat, moon, crows/ravens, ghosts, goblins, banshees, candy/caramel apples, chocolate, Jack-o-Lanterns, costumes, Trick-or-Treats, Death, acorns, bones, gourds, scarecrows
Colors: black, orange, red, silver, gold, brown, purple, yellow
Food and Drink: apples, cider, pork, hazelnuts, pomegranates, pumpkins, potatoes, squash, cranberries, turnips, beats, mugwort tea, ale, mulled wine, pies/cakes for the dead
Herbs: apple leaf, almonds, bay leaf, nettle, hemlock, cloves, cinnamon, mandrake root, marigold, mums, mugwort, pine, rosemary, sage, wormwood, tarragon, rue, garlic, ginger, hazelnut, allspice
Deities: Hectate, The Crone, Cerridwen, Bast, Persephone, Horned Hunter, Cernnunos, Osiris, Hades, Anubis, Loki, Arawn, Dis, and any other death/underworld god or goddess
Crystals and Gemstones: black obsidian, jasper, onyx, bloodstone, smoky quartz, carnelian,
Animals: cats, especially black cats, bats, spiders, rats, wolves, snakes, ravens and crows, owls, stags, jackals, scorpions
Magic: This is the time to honor the dead. Set up an altar, serve them cakes, and let them know they are not forgotten. If you wish to communicate with deceased friends and family, this is the best time of year. The veil thins the night of Samhain, making communication easy. Do NOT, however, entice spirits, disrespect them, call demons, or perform any other magic that is anything less than respectful. I repeat, don't do it. Samhain is also a great time to practice divination in the form of runes, scrying, tarot, tea readings, etc. Reflect over the previous year and perform blessing spells to ring in the new year. Astral projection and lucid dreaming is also much easier to perform on this night, but remember to be safe, Banishing magic, especially those for bad habits, are especially strong on this night.
Please note this is not a complete list but a brief overview of symbols, colors, herbs, deities, and the like. If I have missed something that you feel should make the list, please feel free to contact me via the comments or through email.