Rabbinically prohibited activities of Shabbat
In Jewish religious law (halakha), Jews are commanded to rest on Shabbat, and refrain from performing certain types of work. Some of the activities are considered to be prohibited by biblical law (the 39 Melachot), while others became prohibited later on, due to rabbinic decrees.
Source: Wikipedia — Rabbinically prohibited activities of Shabbat (CC BY-SA 4.0)