In common parlance, 'pepper' is usually understood to mean either black pepper or chili pepper. By true pepper we mean the fresh and dried fruits of pepper plants, plants belonging to the plant family Piperaceae. They are the only plant species that contain the pungent substance piperine, an alkaloid, just like capsaicin, the pungent substance in chili peppers.
The most famous true pepper is black pepper, with the botanical name Piper nigrum. In Depeperwinkel you will find various family members of this plant species, which also contain piperine and are also used as pepper. Including the long peppers and the tail peppers, including the wild voatsiperifery pepper.