What is the term for a small amount of liquid poured on top of a cocktail?

The term for a small amount of liquid poured on top of a cocktail is referred to as a "float." This technique involves carefully layering a different colored liquid on top of the main drink, creating a visually appealing presentation and sometimes adding a new flavor as the layers mix when consumed. The float is typically done by pouring the liquid over the back of a spoon to prevent it from mixing too much with the underlying liquid.

This technique is commonly used in various cocktail recipes to enhance both the appearance and the complexity of flavors in the drink. It's important to note that this is distinct from other terms like a dash (a small splash of a liquid, often bitters), which does not involve a layered presentation; or garnishes, which are usually solid items added to enhance aesthetic or flavor, such as fruit or herbs. The same goes for layering, which generally refers to building multiple distinct layers but is not specifically the term used when an additional liquid is being poured on top of an existing cocktail.