The mark consists of a line drawing representing the central section of an arched Palladian window. The drawing consists of a vertically-aligned rectangle with a semicircle adjoining it at its top. A smaller concentric semicircle, and lines radiating from it to the larger semicircle, represent muntins dividing individual glass panes. A grid of additional horizontal and vertical lines within the rectangle represent additional muntins dividing glass panes. To the left of the line drawing are the capital letters "T", "P" and "W", aligned horizontally. The background of the letters and drawing is transparent.