1, "Pisces" is the Latin word for "Fishes". It is one of the earliest zodiac signs on record, with the two fish appearing as far back as c. 2300 BCE on an Egyptian coffin lid.
2, Pisces is used to represent the Goddess much further back into the past because of its association with the Vesica Piscis. The curved H of the Pisces symbol converts into the Vesica Piscis when the curved sides are crossed to the opposite side of the central arm.
Here is an animation showing how the Pisces symbol converts into the Vesica Piscis.
3, Many Christian symbols for Christ use the astrological symbol for Pisces, the fish. The figure Christ himself bears many of the temperaments and personality traits of a Pisces, and is thus considered an archetype of the Piscean. We are currently in the age of Pisces, once this age is over Jesus will no longer be the God of the age. Moreover, the twelve apostles were called the "fishers of men," early Christians called themselves "little fishes," and a code word for Jesus was the Greek word for fish, "Ikhthues". With this, the start of the age, or the "Great Month of Pisces" is regarded as the beginning of the Christian religion. Saint Peter is recognized as the apostle of the Piscean sign.
Pisces has been called the "dying god," where its sign opposite in the night sky is Virgo, or, the Virgin Mary. When Jesus was asked by his disciples where the next Passover would be, he replied to them:
Behold, when ye are entered into the city, there shall a water bearer pouring out water from a pitcher... follow them into the house where they entereth in.
—Jesus, Luke 22:10
This coincides with the changing of the ages, into the Age of Aquarius, as the personification of the constellation of Aquarius is a water bearer pouring out water from a pitcher, the water representing enlightenment for the people in the new age.
4, One Greek myth, Pisces represents the fish into which Aphrodite (also considered Venus) and her son Eros (also considered Cupid) transformed in order to escape the monster Typhon. Typhon, the "father of all monsters" had been sent by Gaia to attack the gods, which led Pan to warn the others before himself changing into a goat-fish and jumping into the Euphrates. A similar myth, one which the fish "Pisces" carry Aphrodite and her son out of danger, is resounded in Manilius' five volume poetic work Astronomica: "Venus ow'd her safety to their Shape." Another myth is that an egg fell into the Euphrates river. It was then rolled to the shore by fishes. Doves sat on the egg until it hatched, out from which came Aphrodite (This is the origin of Easter eggs). As a sign of gratitude towards the fishes, Aphrodite put the fish into the night sky. Because of these myths, the Pisces constellation was also known as "Venus et Cupido," "Venus Syria cum Cupidine," Venus cum Adone," "Dione," and "Veneris Mater," the latter being the formal Latin term for mother.
The Greek myth on the origin of the sign of Pisces has been cited as an example of the fables that arose from the original astrological doctrine, and that the original intent of it was afterwards corrupted both by poets and priests.
5, While the astrological sign Pisces per definition runs from elliptical longitude 330° to 0°, this position is now mostly covered by the constellation of Aquarius, due to the precession from when the constellation and the sign coincided. Today, the First Point of Aries, or the vernal equinox is in the Pisces constellation. There are no prominent stars in the constellation, with the brightest stars being of only fourth magnitude. One star in the constellation, Alpha Piscium, is also known as Alrescha which comes from the Arabic الرشآء al-rišā’, meaning "the well rope," or "the cord." Ptolemy described Alpha Piscium as the point where the cords joining the two fish are knotted together. The astrological symbol shows the two fishes captured by a string, typically by the tails. The fish are usually portrayed swimming in opposite directions; this represents the duality within the Piscean nature. The Piscean is seen as the most balanced of all the star signs. Which is why the two fishes are often shown in a ying yang formation. The fish facing upwards away from the ecliptic is swimming towards the heavens, or is seeking spiritual illumination. The other fish swims along the ecliptic, concerning itself with material matters.
6. Pisces is also sometimes represented as two dolphins or mermaids. The Pisces being the most watery of all water signs, the sea is their domain and at times a Piscean can feel they are not of the Earth, but we are not talking about another planet, just that they would feel much happier swimming or boating, than on dry land.
7, In esoteric astrology, Venus was considered the ruler of Pisces, and prior to the discovery of Neptune in 1846, Jupiter was said to rule Pisces. Neptune is mostly considered the ruling planet of Pisces today because of the association with the Roman god of water and the sea, Neptune. The detriment, or the sign "opposite" to that which is deemed the ruling planet, is Mercury. Venus is exalted in Pisces, and Mercury falls in Pisces.
8, The enchanting and mysterious Pisces is the sign of the psychic. In tune with the synchronicities of the Earth and universe and very intuitive, Pisces is also a natural healer. A pleasure to bestow as a friend or partner, yet difficult to understand, Pisces is sure to continually keep you guessing. They have a strong tendency to give more than they ask of their acquaintances, are intensely loyal and tend to connect with other like minded spirits.
9, Pisces, were born on this planet with that famous intuition that rarely lets them down. These traits which are abundant within a Pisces person come as no surprise - Pisces is the child of Neptune, the planet of altered states. Neptune is known for dissolving boundaries, and because Neptune is the "patron planet" of Pisces, that gift has been passed along to them. Pisces are often found getting lost within a movie, a magical moment or fantasy, and often leave the harshness of reality behind whenever the need arises. This is truly a great gift to bestow.
10, Pisces is also the most in tune with emotions of the signs, hands down. Nobody can "feel" things the way a Pisces can - a Pisces seems to know what it feels like to break a leg, even if they've never broken one. They can walk into a room and instantly feel the vibe, and have no problem interpreting the negative or positive energies emitting from people and experiences. Their incredible intuition often leaves them the kind of insights that will make you assume they can read your mind, and they often can. When a Pisces goes against their instincts, it's normally not a positive result. Pisces people need to remember their ability to see things for what they truly are, and to follow those instincts because they will rarely lead them astray.