What Is The Purpose Of An Onion Dome?

What Is The Purpose Of An Onion Dome? Onion domes are popularly believed to symbolize burning candles. Similar dome shapes: helmet-shaped, pear-shaped. Numbers: Onion domes often appear in groups of three, representing the Holy Trinity, or five, representing Jesus Christ and the Four Evangelists. Domes standing alone represent Jesus. Why are Russian domes onion shaped?