A "horn button" is a unique type of button that can be characterized  as follows:

‌Natural Material‌: Crafted from the horns of cows, it offers an authentic and organic touch to garments and accessories.

‌Distinctive Appearance‌: The button's surface often showcases the natural texture and color variations of the cowhorn, ranging from rich browns to subtle grays, with unique patterns and grains.

‌Durability‌: Cowhorn is a strong and resilient material, ensuring that the button can withstand daily wear and tear, making it ideal for long-lasting use.

‌Eco-Friendly‌: As a renewable resource, cowhorn buttons are an environmentally conscious choice, promoting sustainability in fashion and accessories.

‌Versatile Style‌: The rustic and timeless appeal of cowhorn buttons makes them suitable for a wide range of designs, from vintage and country-inspired to modern and chic.

‌Cultural Significance‌: In certain cultures, cowhorn is imbued with symbolic meaning, representing strength, protection, or good fortune, adding a layer of cultural depth to the button.

‌Tactile Quality‌: The natural texture of the cowhorn provides a tactile experience that enhances the overall sensory appeal of the item it adorns.

‌Customizable‌: Cowhorn buttons can be shaped, sized, and finished in various ways to suit different design needs and preferences.

In summary, a cowhorn button is notable for its use of natural material, distinctive appearance, durability, eco-friendliness, versatile style, cultural significance, tactile quality, and customizability.