fractal
noun [ C ] mathematics specialized uk/ˈfræk.təl/ us/ˈfræk.təl/
分形，碎形（数学里，利用简单的形状，将其不断重复，每次重复都把形状缩小，如此构成的复杂的不规则线条或图案）
a complicated pattern in mathematics built from simple repeated shapes that are reduced in size every time they are repeated
The way that the trunk of a tree divides into smaller and smaller branches and twigs is an approximate fractal pattern. 树干逐渐分成小树枝、嫩枝的方式类似一个不规则碎片形。