Maltese cross (optics)
Appearance
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Spherulite_1.png/220px-Spherulite_1.png)
In polymer physics, Maltese Cross is a set of four symmetrically disposed sectors of high extinction that is displayed when a polymer is observed under polarized lights. This is usually observed when trying to observe spheruliltes in polymers.