Learn English – What do you call a subcategory of a subcategory

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What do you call a subcategory of a subcategory?

Is there any particular term that can be used or should I use any other words such as group, set, collection etc.?

Edit:
For Example if A is a category, B is a subcategory of A and C is a subcategory of B, what do you call C with respect to A?

Best Answer

Informally, a lot of people will use the word/phrase subsubcategory (or sub-sub-category).

I would advise against using it in formal writing (for formal writing use further subcategory as @Chenmunka suggested) but the meaning is completely clear and would not sound unnatural as it is used by many native speakers.

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