A fractal is a mathematical object that has the property of being self-similar. If you zoom in on the boundary or region of a fractal it appears to be the same as the original object. The boundary of the Mandelbrot set is a fractal as are the Koch snowflake, the Sierpinski triangle, and the Cantor Set, all of which have appeared on stamps.
| Stamp | Description |
|---|---|
 |
Hungary, 24Ft, 1996 Scott Sierpinski pyramid |
 |
Finland, 3.50m, 2000 Scott 1140 A595 Sierpinski Triangle |
 |
Sweden, 6k, 2000 Scott: 2403 A741a Sweden, 6k, 2000 Scott: 2403 A741b Koch Snowflake |
 |
Spain, 155, 2001 Portion of the Mandlebrot Set |
 |
Macau, 2005 Scott: 1184 A266 a Hilbert Space Filling Curve |
|
Macau, 2005 Scott: 1184 A266 b Bifircation, Fractal tree |
|
Macau, 2005 Scott: 1184 A266 c Sierpinski Triangle |
|
Macau, 2005 Scott: 1184 A266 d Chaos Game: Sierpinski Triangle |
|
Macau, 2005 Scott: 1184 A266 e Koch snowflake |
|
Macau, 2005 Scott: 1184 A266 f Cantor Set |
 |
Macau, 8, 2005 Julia Set Sheet shows Mandlebrot Set |
 |
Palau, 80 cents, 2005 Portion of the Mandlebrot Set |