Short answers, pulled from the story.
Mercury is a major god in Roman religion, one of the twelve Dii Consentes. He is the god of boundaries, commerce, communication, eloquence, financial gain, languages, luck, thieves, travelers, trickery, and the guide of souls to the underworld.
The name Mercury is possibly related to the Latin word merx, meaning merchandise, and to mercari, meaning to trade. Another possible root is the Proto-Indo-European word merĝ-, meaning boundary or border, which also connects to Old English, Old Norse, and Latin words for edge and margin.
Mercury's temple in Rome was built in 495 BC, situated in the Circus Maximus between the Aventine and Palatine Hills. Its dedication on the 15th of May, 495 BC, gave rise to the annual festival called the Mercuralia, celebrated on the same date.
The Romans identified the Germanic god Wotan as an equivalent of Mercury through a practice called the interpretatio romana. The 1st-century writer Tacitus named Wotan the chief god of the Germanic peoples. This identification survives in the English word Wednesday, derived from Wotan, and the French Mercredi, derived from Mercury.
Mercury served as psychopomp, guiding the souls of the newly deceased to the afterlife. Ovid also wrote that Mercury carried the dreams of the god Morpheus from the valley of Somnus to sleeping humans, and in Ovid's Fasti, Mercury escorts the nymph Larunda to the underworld.
The Mercury dime was a United States coin issued from 1916 to 1945. It does not depict the god Mercury; it shows Winged Liberty, a female figure wearing a Phrygian cap rather than a winged helmet. The coin acquired its popular name due to the resemblance to Mercury's iconography.