Here is a complete list of the 45 classes from the Nice Classification system, which is used for the registration of trademarks. The first 34 classes cover goods, and the remaining 11 cover services.
Class 1: Chemicals used in industry, science, and agriculture (e.g., industrial chemicals, fertilizers, and plastic materials).
Class 2: Paints, varnishes, lacquers; preservatives against rust and against deterioration of wood; colorants; mordants; raw natural resins; metals in foil and powder form for painters, decorators, printers, and artists.
Class 3: Cosmetics and cleaning preparations (e.g., soaps, perfumes, cosmetics, toothpaste, cleaning agents).
Class 4: Industrial oils and greases; lubricants; dust absorbing, wetting, and binding compositions; fuels (including motor spirit) and illuminants; candles and wicks.
Class 5: Pharmaceutical and veterinary preparations; sanitary preparations for medical purposes; dietary supplements for humans and animals; medical plasters, bandages, and materials.
Class 6: Common metals and their alloys; metal building materials; transportable buildings of metal; materials of metal for railway tracks; non-electric cables and wires of common metal; ores.
Class 7: Machines and machine tools; motors and engines (except for land vehicles); machine coupling and transmission components (except for land vehicles); agricultural implements other than hand-operated; incubators for eggs.
Class 8: Hand tools and implements (hand-operated); cutlery; razors.
Class 9: Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signaling, checking, life-saving, and teaching apparatus and instruments; electrical and scientific apparatus.
Class 10: Medical apparatus and instruments (e.g., surgical, dental, and veterinary instruments).
Class 11: Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply, and sanitary purposes.
Class 12: Vehicles; apparatus for locomotion by land, air, or water (e.g., cars, bicycles, ships, airplanes).
Class 13: Firearms; ammunition and projectiles; explosives; fireworks.
Class 14: Precious metals and their alloys; jewelry, precious stones; horological and chronometric instruments.
Class 15: Musical instruments.
Class 16: Paper, cardboard, and goods made from these materials (e.g., stationery, printing materials, books, and printed matter).
Class 17: Rubber, gutta-percha, gum, asbestos, mica, and goods made from these materials (e.g., seals, packing materials, insulation).
Class 18: Leather and imitations of leather; animal skins, hides; trunks and traveling bags; umbrellas, parasols, and walking sticks; saddlery and harness.
Class 19: Building materials (non-metallic); non-metallic transportable buildings; materials for railway tracks; non-metallic pipes; asphalt, pitch, and bitumen; non-metallic roads and pavings; monuments.
Class 20: Furniture, mirrors, picture frames; articles (not included in other classes) of wood, cork, reed, cane, wicker, horn, bone, ivory, whalebone, mother-of-pearl, shell, amber, meerschaum, and substitutes for these materials.
Class 21: Household or kitchen utensils and containers; combs and sponges; brushes (except paintbrushes); articles for cleaning; steel wool; unworked or semi-worked glass (except glass used in building); porcelain, ceramic, earthenware, and glass.
Class 22: Ropes, string, nets, tents, awnings, tarpaulins, sails, sacks, and bags (not included in other classes); padding and stuffing materials; raw fibrous textile materials.
Class 23: Yarns and threads, for textile use.
Class 24: Textiles and textile goods, not included in other classes; bed and table covers.
Class 25: Clothing, footwear, headgear.
Class 26: Lace and embroidery, ribbons, and braid; buttons, hooks and eyes, pins and needles; artificial flowers.
Class 27: Carpets, rugs, mats, and matting; linoleum and other materials for covering existing floors; wall hangings (non-textile).
Class 28: Games, toys, and playthings; gymnastic and sporting articles not included in other classes; decorations for Christmas trees.
Class 29: Meats and processed foods; preserved, frozen, dried, and cooked fruits and vegetables; jellies, jams; eggs; dairy products; edible oils and fats.
Class 30: Coffee, tea, cocoa, sugar, rice, tapioca, sago, artificial coffee; flour and preparations made from cereals; bread, pastry, and confectionery; edible ices; honey, treacle; yeast, baking-powder; salt; mustard; vinegar; sauces (condiments); spices; ice.
Class 31: Agricultural, horticultural, and forestry products and grains not included in other classes; live animals; fresh fruits and vegetables; seeds; natural plants and flowers; foodstuffs for animals; malt.
Class 32: Beers; mineral and aerated waters and other non-alcoholic drinks; fruit drinks and fruit juices; syrups and other preparations for making beverages.
Class 33: Alcoholic beverages (except beers).
Class 34: Tobacco; smokers' articles; matches.
Class 35: Advertising; business management; business administration; office functions.
Class 36: Insurance; financial affairs; monetary affairs; real estate affairs.
Class 37: Building construction; repair; installation services.
Class 38: Telecommunications services.
Class 39: Transport; packaging and storage of goods; travel arrangement.
Class 40: Treatment of materials (e.g., metalworking, textile treatment).
Class 41: Education; providing of training; entertainment; sporting and cultural activities.
Class 42: Scientific and technological services and research and design relating thereto; industrial analysis and research services; design and development of computer hardware and software.
Class 43: Services for providing food and drink; temporary accommodation.
Class 44: Medical services; veterinary services; hygienic and beauty care for human beings or animals; agriculture, horticulture, and forestry services.
Class 45: Legal services; security services for the protection of property and individuals.
This classification helps to properly identify the type of goods or services associated with a trademark to ensure it is registered in the correct category.

