"Одноклавішні" (single-key) refers to a type of musical instrument, specifically a keyboard instrument that features only one key or note. This design allows for simple melodies to be played, making it accessible for beginners and young children. Instruments like the xylophone or marimba can sometimes be categorized as одноклавішні when they focus on single-note play. In a broader context, одноклавішні can also describe any device or tool that operates with a single button or key. This simplicity is often found in user-friendly gadgets, such as remote controls or keyboards, where one key performs a specific function, enhancing ease of use for individuals.