- Symbol
- ☿︎ (U+263F)
- Orbit
- 88 days
- Day and metal
- Wednesday, quicksilver
- Rules
- Gemini and Virgo
Reading the glyph from the bottom up
Most astrology handbooks explain the symbol as three stacked parts. This is a symbolic reading handed down in the tradition, not a record of who drew it first.
1. The cross
At the base it stands for matter and the material world, the place where an idea has to become a word, a letter or an object.
2. The circle
In the middle it is the old sign for spirit or the whole self, and the same circle sits alone in the Sun symbol.
3. The crescent
On top it is the receptive mind, the same crescent that appears in the Moon symbol, here placed above the circle as a pair of horns or a hat.
Where the shape comes from
The form most often traced for this glyph is the caduceus, the winged staff with two entwined snakes that Hermes, the Greek counterpart of Mercury, carried as a herald. Medieval manuscripts shortened the sign into a compact figure, and by the Renaissance printers had settled on the circle, crescent and cross that is used now. A second line of explanation says the shape began as an abbreviation of the Greek name for the planet, which the scribes then simplified. The sources do not agree on which came first, and it may be both.
The planet itself is the smallest planet and the closest to the Sun, circling it in 88 days, the shortest year in the solar system. From Earth it hugs the Sun, so it is seen only low in the sky near dawn or dusk and never high at midnight. In the old astronomy that quickness made it the planet of messages.
One sign, two meanings: the planet and the metal
Alchemists used the same glyph for the substance now called mercury, and the chemical symbol Hg is a later arrival.
| In | The glyph means | Why |
|---|---|---|
| Astrology | The planet Mercury | The planet of thought, speech, learning and short journeys. |
| Alchemy | Quicksilver | The liquid metal that moves and cannot be held, linked to the planet's speed. |
| Chemistry | Not used | The element mercury is written Hg, from the Latin hydrargyrum, meaning water silver. |
Where you meet the Mercury symbol
- In birth charts, where it labels the planet's position in a sign and a house.
- In ephemerides and calendars that mark Mercury retrograde, the three or four times a year the planet appears to move backward.
- In printed tables of planetary days, where it stands for Wednesday, which takes its name from the Norse god Woden in English and from Mercury in French and Spanish.
- In jewellery and tattoo work, usually chosen as a sign of communication, writing or study.
Typing it and making sure it looks right
Unicode lists it as MERCURY at U+263F (☿︎), and most fonts include it. Where it shows as a coloured picture or a box, add the variation selector U+FE0E after it to ask for the plain text form. For astrology work, a font such as Noto Sans Symbols covers the planets, signs and aspect glyphs together.
Why Mercury changes sign so quickly
Because Mercury stays close to the Sun, it moves through the zodiac at about the Sun's pace and sometimes faster. It spends two to four weeks in a sign, longer when it turns retrograde, and it tends to appear in the same sign as the Sun or in the sign on either side of it. Mercury and the Sun are never more than 28 degrees apart in the sky, so no one has Mercury more than one sign away from their Sun sign.
That narrow range makes Mercury easy to place. If you know your Sun sign, your Mercury is in that sign or the one just before or after it, and the birth chart calculator gives the exact one.
Find it in your own chart
A symbol or an aspect only means something against a whole chart. Look up your placements, then read the planets in their signs and the houses they fall in.
Frequently asked questions
What does the Mercury symbol mean?
It is read as a circle of spirit between a crescent of the receptive mind and a cross of matter, which fits Mercury's role as the planet of thought and speech.
Which character do I type for the Mercury symbol?
☿︎, which is U+263F. In HTML you can write ☿ to produce it.
Is the planet symbol the same as the one for the element?
Only in alchemy, where one glyph covered the planet and the metal quicksilver. Chemistry writes the element as Hg.
Why does Mercury look like a horned figure?
The crescent on top is the same shape used for the Moon glyph. The pattern is often compared to the winged hat or the caduceus of the messenger god.
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