“Kindle” is a traditional collective noun for kittens, often used in word lists and reference compilations. A typical litter is often ~3–6 kittens (breed and care dependent), which is why the term is usually applied to a small group.
🤯 "A group of kittens is called a kindle — because clearly, even chaos needs a cute name before it knocks over your coffee, eats your charger, and claims your laptop as its throne."