The simple Simon over bend is a knot belonging to the category bend. The simple Simon under holds well even with slippery synthetic ropes, but is less secure than the similar simple Simon under.
The difference is just whether the green working end goes over the green standing (loaded) end (Simple Simon over) or under the green standing (loaded) end (simple Simon under).
It was invented by Dr. Harry Asher and published in 1989.
Tie as shown in the images. In the sheet bend, the two running ends should emerge on the same side of the knot.