Possible Clues:

• Peer round vertical line, joining afterwards to form square, say
• Other characters are all quite square, possibly?
• (Of a triangle) having sides the same
• Like the figure formed by the three circled letters at the bottom
• A triangle with angles of 60 degrees is ____
• No time for drink later, playing a sort of triangle
• Not really at all queer, I figure that's the same on all sides
• Three of the five Platonic solids have ____ triangles as faces
• Quit real ale, possibly, like some figures on plane