What does dichotomous venation mean in Ginkgo biloba leaves?

In Ginkgo biloba, dichotomous venation refers to a specific pattern where the leaf's veins branch in a forked, two-way manner.1

This process begins when two vascular bundles extend through the leaf stalk (petiole) and subsequently give rise to two systems of veins that repeatedly divide into two equal branches. This arrangement is often described as an "open" type of venation because the veins typically do not fuse, although it has been observed that vein unions can occur with some regularity. This striking morphological characteristic is a defining feature of the ginkgophyte leaf blade.1