This chapter shows how to draw two classic fractals: the Sierpinski Triangle and the Koch Snowflake. Both of these have a long history in mathematics and in graphics. They are often used in programming books to show recursion with graphics.
Sierpinski is pronounced sehr-'pin-ski (accent on pin).
Koch is pronounced Kokh. The "ch" is like the "ch" in the composer Bach.
These Wikipedia articles may be of interest:
How many sides does a triangle have?