Everything that is worshipped, or followed or obeyed other than Allah (SWT) is Taghut.
There are many but their leaders are five.
The leaders of Taghut are:
1. Shaitan (Satan), may Allah (SWT) curse him. Ameen.
2. Anyone who is worshipped with his consent.
3. A person who calls the people to be worshipped instead of Allah (SWT).
4. A person who claims the knowledge of Ghaib (unseen, hidden, invisible, absent, etc.)
5. The ruler who rules by laws other than the law sent down by Allah (SWT).