When an adverb modifies another adverb what is the modifying adverb called

When an adverb modifies another adverb, the modifying adverb is often referred to as a "degree adverb" or "intensifier." These adverbs provide additional information about the intensity, manner, or degree of the adverb they modify. For example, in the phrase "very quickly," "very" is an adverb that modifies the adverb "quickly."