A biscuit that doesn't have any sugar added to it when baking is typically referred to as a "plain" biscuit. Plain biscuits are savory and do not contain any sweeteners like sugar, making them versatile for both sweet and savory applications.
In some regions, plain biscuits are also known as "unsweetened biscuits" or "salted biscuits," depending on the specific ingredients used in the recipe. They are often enjoyed as a side dish, accompaniment to meals, or as a base for sandwiches. In contrast, sweet biscuits, also known as cookies in some countries, are made with sugar and are commonly enjoyed as a dessert or a sweet snack.