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The mark consists of drafting compass opened to ninety degrees, facing down and to the right; a drafting triangle with internal angles of 45 degrees, 45 degrees, and 90 degrees subtends the opened compass, with the 90 degree angle toward the lower right, and the two 45 degree vertices near the points of the compass; a second triangle of the same proportion and orientation is inscribed in the open space bounded by the first triangle's hypotenuse and the legs of the compass. The word "principal" is written horizontally to the right of the graphic in capital letters. Above and below the text are horizontal lines equal in length to the writing. The lines and text have shadowing.