The regular pentagon is a uniform, five-sided structure closely
associated with the planet Venus, . The Venus goddess was in
ancient times both a war and a fertility divinity. The promoters of
the Christian ideology sought to suppress the sexual pleasure aspects
of this ancient goddess when transforming her to the chaste Virgin
Mary. Therefore, they had to carefully retain all the rest of what the
goddess stood for, lest they create disobedience and ideological
havoc. They were more than happy to retain the aggressive and
warmongering aspect: Venus as the goddess of warfare. During the
sixteenth, seventeenth and eighteenth centuries the pentagon, as a
structure closely associated with the pagan goddess through the
celestial movements of the planet Venus, was common as a basic
design for fortresses. Reminiscences of this are still to be found
today, as, for example, in the US Pentagon complex near Washington, a
military headquarter although not a fortress in the usual sense of the
If one plots the position of the planet Venus in the zodiac when it first appears as the Morning or Evening star after a period of invisibility (at ), then waits until disappears again, then repeats the procedure the next time Venus reappears either as the Morning or the Evening star, and does this for a period of 1,460 days (i.e. exactly four years), if a line is drawn between each of the positions, from the first to the second, etc. the design revealed when all the points have been joined together is that of an exactly regular pentagon. For this reason is closely associated with in Group 27. It is thereby also related to , an ideogram widely used by armed forces both in the West and in the East (in fact over the whole planet). For a more detailed description of the relation between and , read the entry in Group 29.
seems to be used in very few, if any, of the established Western ideographic systems. Compare this with the fact that the structure is used in over 40 different systems, and that appears in about 20 sign systems.
However, is quite frequently used in the business world as a logotype.
See for instance Simca's .