Harmony, nurturing, and the beauty of balance. Six is the "perfect" number in mathematics (1+2+3=6) and represents love, home, and responsibility.
The Star of David β two interlocking triangles. The six days of creation in Genesis. The "perfect number" in Pythagorean and medieval mathematics.
Extremely lucky β sounds like "flow" or "smooth" (liΓΉ), implying smooth progress and good luck. 6-6-6 dates are popular for weddings and business openings.
Vav β hook, connection. The six directions of space (North, South, East, West, Up, Down). Tiferet (Beauty) in the Tree of Life β the heart of the Sephirot.
Six schools of Hindu philosophy (Shad Darshanas). Six seasons in the Hindu calendar. Six tastes (rasas) in Ayurveda. Six chakras below Sahasrara.
Six realms of existence (gods, demigods, humans, animals, hungry ghosts, hell beings). Six perfections (paramitas) on the Bodhisattva path.
Six days of creation according to Islamic tradition (same as Biblical). Six articles of faith (Iman): God, Angels, Books, Prophets, Day of Judgment, Divine Decree.
Mostly positive β uniquely lucky in Chinese culture, sacred in Judaism, but shadowed in Western popular culture by the "Number of the Beast" from Revelation.