Your "pentakal" is not a sign of dark magic it is the pagan symbol for fertility and is commonly refered to dark arts/ satanic worshiping but know its roots. Just like the Swastika, which isnt bad at all just charactereized badly by Hitler
Much like everything that is maligned for dark purposes, a pentacle if point-up is the fertility thing (or Rush's logo.) Point the tip down and throw a goat head in it and whammo blammo, you gots yer satanic belt-buckle. Same goes with a cross, turn it upside-down and there ya go... blaaaack metaaaaaaal!!!!!oneoneone111
There's also the clockwise vs. counterclockwise swastika junk, but I consider it co-opted by the nazis regardless of direction. Too bad, but waddya gonna do?
The swastika (from Sanskrit ???????? svastika, from su "well", and asti "being", thus "good fortune" or "well-being") is an equilateral cross with its arms bent at right angles in either left-facing (?) or right-facing (?) direction.
- Wikipedia
So swastika means well being regardless of direction.
Secondly, you mean pentagram.
A pentacle or pantacle is an amulet used in magical evocation, generally made of parchment, paper or metal (although it can be of other materials), on which the symbol of a spirit or energy being evoked is drawn.
A pentagram (sometimes known as pentalpha or pentangle) is the shape of a five-pointed star drawn with five straight strokes. The word pentagram comes from the Greek word ???????????? (pentagrammon), a noun form of ???????????? (pentagrammos) or ???????????? (pentegrammos), a word meaning roughly "five-lined" or "five lines".
Pentagrams were used symbolically in ancient Greece and Babylonia. The Pentagram has magical associations, and many people who practice pagan faiths wear them. Christians once more commonly used the pentagram to represent the five wounds of Jesus[1][2], and it also has associations within Freemasonry.
The pentagram has long been associated with the planet Venus, and the worship of the goddess Venus, or her equivalent. It is also associated with the Roman Lucifer, who was Venus as the Morning Star, the bringer of light and knowledge. It is most likely to have originated from the observations of prehistoric astronomers.[citation needed] When viewed from Earth, successive inferior conjunctions of Venus plot a nearly perfect pentagram shape around the zodiac every eight years.
- Wikipedia (again)
Also, Christianity also uses pentagrams pointing down.
http://en.wikipedia.org/wiki/Pentagram
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