What term describes the opposite of "back" in positioning?

The term that describes the opposite of "back" in positioning is actually related to the concept of orientation, where "front" serves as the counterpart to "back." The most precise term for this relationship is "front," as it directly signifies the area that is opposite to the back of an object or space.

In providing an accurate understanding, it’s important to note that "not front," as depicted in the answer chosen, lacks specificity and clarity. The other terms such as "above" and "below" pertain to vertical positioning rather than directly addressing the front-back orientation, while "under" typically refers to something being beneath another object, which is also not relevant to the front-back relationship. Therefore, in positioning contexts, "front" is the most fitting term to consider as the direct opposite of "back."