mini-tower form factor; mini-tower style
Used in computing to describe a PC case or chassis that is smaller than a full tower but larger than a small form factor. Often contrasted with ミドルタワー型 (mid-tower) and フルタワー型 (full-tower).
This PC case is a mini-tower type, balancing expandability and compactness.
mini-tower computer
Compound of ミニタワー (mini-tower) and 型 (type/model). The term is a direct borrowing from English 'mini-tower' used in PC hardware classification.