e heatcell+

#Mathematical signs #Polygons containing one or more letters #Polygons containing one or more quadrilaterals (specify the content) #Polygons containing one or more triangles or lines forming an angle (specify the content) #One polygon #One quadrilateral #Squares #Quadrilaterals with dark surfaces or parts of surfaces #Quadrilaterals containing other figurative elements #Triangles with dark surfaces or parts of surfaces #Letters in light-coloured characters on a dark background #Monograms formed of intertwined, overlapping or otherwise combined letters #Letters in heavy characters #Series of letters in different dimensions #Series of letters presenting different forms of writing