Color is not claimed as a feature of the mark.
The mark consists of four black squares. Between the four black squares, there are white lines which resembles a plus symbol. Each black square contains a letter. In the top left black square, there is the letter "I" in white. In the top right black square, there is the letter "M" in white. In the bottom left black square, there is the letter "O" in white. In the bottom right black square, there is the letter "S" in white.