This blog is focused on Jewish Stars of David (Magen David), but includes information also about the following subjects which refer to other sorts of hexagrams in other cultures:
Bronze Age hexagrams
Iron Age hexagrams
Arabs' and Muslims' hexagrams
Christian hexagrams
Eastern Religions hexagrams
Alchemy hexagrams
Witchcraft, Occultism hexagrams
Astrology hexagrams
Estoiles
Mullets (or molets)
Chinese checkers
Shatkona (Yantra), Mandala, Indian hexagrams
Snowflakes
Scientific
Raelism
Non Jewish heraldry and flags
Red Magen David
Theosophy
Zion Christian Church
Latter-day Saints (Mormons)
Buddhism Hinduism and Jainism