（1）Piecewise linear complex (PLC) 分段线性复合形
（2）Cell complex 单元复形  （胞腔复形？ 元胞复形）
A subset of a cell complex is called a subcomplex if it is a union of cells of containing the closures of such cells. Thus, the -dimensional skeleton of is a subcomplex of . Any union and any intersection of subcomplexes of are subcomplexes of .
Any topological space can be regarded as a cell complex — as the union of its points, which are cells of dimension 0. This example shows that the notion of a cell complex is too broad; therefore narrower classes of cell complexes are important in applications, for example the class of cellular decompositions or CW-complexes (cf. CW-complex).
（3）Linear Cell Complex 线性单元复形 （参考）
给定一组平面曲线（planar curves）, arrangement是将平面分解subdivision of the plane为0维zero-dimensional, 一维（线）one-dimensional 二维（面）单元 two-dimensional cells, 称作节点vertices、边 edges和面元 faces