Mercury - "The God's Messenger"...
He's all about communication - on all levels (including the internet or psychic) - of course, this includes speech, writing or any other form of communication, record keeping etc. He's fast, agile, intelligent and mutable. Commerce is another big themes of his and it's said he can be pretty "tricky". Probably because his siblings are the other gods, he's also a lot about siblings and family in the meaning of being the Messenger and "middle person".... he's also good in multitasking, he's curious and embraces the "New".
He rules the neurological systems in our body and because of this, he also is about our inner "communication". On the physical level but also about how we think and "talk" to ourselves, aloud or silent...
Greek Mythology: Hermes is the son of Zeus and Maia (daughter of the Titan Atlas). From the beginning he was very vivid, loved nature and to play "little tricky games" with Humans and the other Gods (a trickster). His playful creativity did produce the famous Lyra, which he later gave to Apollo. Most of all he was the "Messenger" and also guided the Souls to the gates of Hades. Also was he thought about being the god of commerce and travels. He got "feathered" feet and helmet to travel fast and the caduceus made it possible to travel without problems - as symbol of neutrality.
He's also linked to the Egyptian God Thoth (Scribe - record holder) and as that "profession" also been linked to Archangel Metatron.
Some Astronomy: Its orbit around the Sun takes 87.97 Earth days, the shortest of all the planets in the Solar System. His apparent distance from the Sun (as viewed from Earth) never exceeds 28°. Mercury's axis has the smallest tilt of any of the Solar System's planets (about 1⁄30 degree). Its orbital eccentricity is the largest of all known planets in the Solar System; at perihelion, Mercury's distance from the Sun is only about two-thirds (or 66%) of its distance at aphelion. Mercury is one of four terrestrial planets in our system, and is a rocky body like Earth. It is the smallest planet in the Solar System, with an equatorial radius of 2,439.7 km (1,516.0 mi). - Ref. Wikipedia
Mercury's orbit, cycle and resonance
He's a slow "spinner" - he rotates around his own axis in 58.7 Earth days (called a sidereal day or Mercury day). He orbits the Sun once in 87,97 days and got a synod with Earth every 116 days. His Sun-day is 176 Earth-Days. In one Orbit, he rotates 1,5 times and after 2 orbits he faces the Sun from the same side again = 3 : 2 resonance. It's interesting that the Earth-Mercury synodic time is almost 2 rotations of Mercury.....
Credit Illustration of this 3:2 resonance:
NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington