No. All planets have a symbol as do do the dwarf planets and a number of asteroids.
See related link for a list of the symbols.
it symbolizes poseidon because neptune is named after poseidon
The symbol of a trident is used to represent the planet Neptune in physics and astronomy. Neptune is the eighth and farthest known planet from the sun in our solar system.
Neptune is named after the god of the sea. The symbol is a trident. This is because the god of the sea, Neptune, is generally associated with a trident.
The planet Neptune is often associated with a trident in astrology. Neptune is the ruler of Pisces and is linked to the realm of mysticism, dreams, and intuition. The trident is a symbol of Neptune's authority over the seas and the subconscious mind.
neptune
The Neptune symbol represents the god Neptune in Roman mythology. It consists of a trident, which was a weapon used by Neptune to control the sea. It also symbolizes power, authority, and man's connection to the ocean and its mysteries.
Neptunium's symbol is Np because it is named after the planet Neptune. It is a synthetic element not found in nature and was named after Neptune due to its proximity in the periodic table to uranium, which is named after the planet Uranus.
Pluto is (usually), but it's only a "dwarf planet".
Astronomers named Neptune after the Roman God of the deep sea to uphold the tradition of naming planets after mythical figures. The name wasn't only given because the colour of the planet resembles the ocean, the name also fits the planet well because of its position in "deep" space (deep sea - deep space). The symbol for planet Neptune is the Trident (the weapon favoured by the God Neptune). Neptune's largest moon was also named after the Greek God of the sea's son, Triton.
neptune
What is Neptune's symbol?
Planet Neptune is the eighth planet from the sun.