The mark consists of a box-like figure, created by combining the letters "E", "S", and "i". The right side of the box has a gap to separate the dot of the "i", and there is a bar in the middle to represent the "S". This figure is turned slightly counterclockwise, so the bottom left corner is pointing down. The middle bars of the figure are shaded slightly darker than the rest of the figure to emphasize the difference between the letters. The figure is followed by the letters "E", "S", and "i" with only the "i" not capitalized.
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Color is not claimed as a feature of the mark.