Wikipedia cites estimates of at least how many dim sum types across China?

Wikipedia cites estimates of at least two thousand dim sum types across China.

That figure reflects dim sum as a broad family of small dishes, not a fixed menu. Although strongly associated with Cantonese cuisine, related traditions developed across several Chinese regional cuisines. The count includes steamed, baked, fried, braised, savory, and sweet preparations, along with seasonal and regional variations.

Dim sum culture grew alongside tea drinking and commercial travel. By the tenth century, Guangzhou teahouses were serving small portions with tea, a custom that developed into modern yum cha. Cantonese chefs later incorporated local ingredients and influences from other parts of China and abroad, producing an especially wide range of textures and flavors.

The number is often misunderstood as the number of dishes available in one restaurant. A typical dim sum restaurant offers several dozen choices, while only about 40 to 50 types are commonly sold outside China. Guangdong alone is credited with more than 1,000 varieties, making the national estimate a useful measure of culinary diversity rather than a strict census.