Final answer:
The Antarctic Circumpolar Current is not considered a gyre because it flows in a linear, unbroken path around Antarctica from west to east.
Step-by-step explanation:
The Antarctic Circumpolar Current is not considered a gyre because it does not flow in a circular, closed path like other oceanic gyres.
The Antarctic Circumpolar Current flows from west to east around Antarctica in a linear, unbroken path.
Unlike other oceanic gyres, which circulate within a closed system like a spinning top, the Antarctic Circumpolar Current flows continuously and is not confined by land masses.