No. Thats just the "enter" key. The first six symbols is is the coordinates for the planet you want to travel to and the seventh symbol is the unique symbol for the current planet you're on. (The Point-of-Origin)
Also this is taken from the Wiki
As shown in the picture opposite, the first six symbols act as co-ordinates, creating three intersecting lines, the destination. The Stargate uses the seventh symbol as the point of origin allowing one to plot a straight line course to the destination.