means A small piece of paper or plastic with adhesive on one side, designed to be stuck onto a surface, often bearing a picture, label, or message.

from From 'stick' plus the agent suffix '-er' — literally 'a thing that sticks.' The verb 'stick' traces back to Old English 'stician,' meaning to pierce, stab, or remain fixed in place, with cousins across the Germanic languages. The sense of an adhesive label is comparatively modern, arriving once we had the glue and the paper to make sticking easy and the human urge to label everything in sight.