Answer:
1. Polytheism --- A belief in many gods.
2. Hieroglyph --- Writing system using symbols or pictures to mean objects or concepts.
3. Pictograph --- A kind of writing that used pictures of objects.
Explanation:
1- Polytheism is a religious or philosophical conception based on the existence of several divine beings or gods.
2- The hieroglyphs were a writing system invented by the ancient Egyptians. It was used from the pre-dynastic period until the 4th century.
3- A pictograph is a drawn and non-linguistic iconic sign, which figuratively represents (more or less realistically) a real object, or a meaning.