Is bean countable or uncountable noun?

"Bean" can be both a countable and uncountable noun, depending on the context:

Countable:

* When referring to individual beans: "I ate three beans for breakfast."

* When referring to a specific type of bean: "Black beans are my favorite."

Uncountable:

* When referring to bean as a substance or ingredient: "This soup has a lot of bean in it."

* When referring to the bean plant: "The bean is a climbing vine."

The context will usually make it clear whether "bean" is countable or uncountable.