W means wide (wide-angle), and T means telephoto.

On a camera’s zoom control:

• W zooms out to a wider field of view, so you see more of the scene.
• T zooms in toward the telephoto end, making distant subjects appear larger.

So the labels refer to the lens’s focal-length range: wide-angle at one end and telephoto at the other. A mnemonic like “withdraw” and “towards” may help you remember the direction, but the actual camera terms are wide and telephoto.