Twenty-seven is three cubed, three multiplied by itself three times, and the tradition treats it as three raised to solidity and fullness. In Plato's Timaeus the world-soul is compounded according to two geometric series, one doubling and one tripling, one, two, four, eight and one, three, nine, twenty-seven, so that twenty-seven closes the second series and stands at the far edge of the cosmic proportions. Indian astronomy divides the ecliptic into twenty-seven nakshatras, the lunar mansions through which the moon passes in its roughly twenty-seven-day sidereal circuit, and these mansions govern much of Hindu astrology and the timing of ritual. The near-match between the count and the moon's period is not accidental: the nakshatras are a way of naming where the moon sleeps each night.
Cheiro's 1926 Book of Numbers names twenty-seven the Sceptre and reads it as a promise of authority, power and command, reward arriving from the productive intellect where the creative faculties have already sown good seed, one of the more fully worked-out and consistently positive readings in his whole compound-number scheme; Florence Campbell's 1931 Your Days Are Numbered and Juno Jordan's 1965 systematisation both preserved the Sceptre reading, which sits comfortably beside the number's already-described status as the cube of three and the closing term of Plato's cosmic proportions.