Wednesday is the day of the week between Tuesday and Thursday. The name comes from the Old English wodnesdæg meaning "Woden's day". The astrological sign of the planet Mercury represents Wednesday, which was dies mercurii to the Romans. In English, this became Woden's Day, since the Roman god Mercury was identified with Woden in northern Europe.
When Sunday is taken as the first of the week, the day in the middle of the following week is Wednesday. Correspondingly, the German name for Wednesday has been Mittwoch (literally: "mid-week") since the 10th Century, having displaced the original name: Wochentag.
In the popular rhyme, "Wednesday's Child is full of woe".