The mark consists of yellow equilateral triangle with curved corners, framed with red outlining. The top line of the triangle goes horizontally, and the angle opposite to the top line of the triangle points perpendicularly downwards. Enclosed by the red frame and on the yellow triangle, there are two stylized upper case letters "S" and "F". Letter "S" is located at the upper left of the letter "F", and letter "F" is located at the lower right of the letter "S". Both letters are in red. Letter "S" starts from the middle of the inner top line of the red frame, and ends at two fifths of the inner left line of the red frame. The letter "F" connects separately with one third, two thirds, and six sevenths of the inner right line of the red frame, and six sevenths of the inner left line of the red frame. For the outer lines of the red frame of the triangle, staring from the left angle of the red frame and goes clockwise, there is a lighter red shade along the outer top line of the red frame, then when it goes around the right angle of the red frame, the color lighter red changes gradually to black, the right outer line of the red frame is black, until it reaches the angle pointing perpendicularly downwards the color black changes gradually to grey, the left outer line of the red frame is grey, until it meets the left angle of the red frame. For the inner lines of the red frame of the triangle, staring from the left angle of the red frame and goes clockwise, there is a black shade along the inner top line of the red frame, then when it goes around the right angle of the red frame, the color black changes gradually to lighter red, the right inner line of the red frame is lighter red, until it reaches the angle pointing perpendicularly downwards the color lighter red changes gradually to grey, the left inner line of the red frame is grey, until it meets the left angle of the red frame. When the letters "S" and "F" connects with the inner lines of the red frame of the triangle, namely, from one third to one half of the inner line of the red frame, two fifths and six sevenths of the inner left line of the red frame, and one third, two thirds, and six sevenths of the inner right line of the red frame, the connecting areas are in red. The shades on the left and above of the letters "S", except for the connecting areas between the letters "S" and the inner top line and inner left line of the red frame, are in lighter red color. The shades on the left and above of the letter "F", except for the connecting areas between the letter "F" and the inner top line and inner left line of the red frame, are in lighter red color. The shades on the right and below of the letters "S", except for the connecting areas between the letters "S" and the inner left line and inner right line of the red frame, are in black color. The shades on the right and below of the letter "F", except for the connecting areas between the letter "F" and the inner left line and inner right line of the red frame, are in black color. The shades of the letters "S" and "F" creates a 3-D effect.