Visual language - Visual communication

Perspective - 

In the graphic arts, such as drawing, is an approximate representation, on a flat surface (such as paper), of an image as it is perceived by the eye. The two must characteristic features of perspective are that objects are drawn:

• smaller as their distance from the observer increases
  
• foreshortened: the size of an object's dimensions along the line of sight are relatively shorter than dimensions across the line of sight

Geometric shapes - 

polygon
concave polygon
constructible polygon
cyclic polygon
decagon
digon
dodecagon
nonagon
equiangular polygon
equilateral polygon
honagon
hendecagon
heptagon
hexadecagon
hexagon
lemoine hexagon
icosagon
swastika
octagon
pentagon
regular polygon
regular decagon
regular octagon
regular pentagon
star
star polygon
decagram
octagram
heptagram
pentagram
triangle
acute triangle
equilateral triangle
isosceles triangle
right triangle