As you probably noticed, this program USES slightly different notation for vector type names than used previously.

正如您可能已经注意到的，这个程序对向量类型名使用的符号与前面使用的符号稍有不同。

youdao

notation is just the way physicists denote "a vector (or state) called X".

标记正是物理学家们表示“名叫 X 的向量（或状态）”的方式。

youdao

The notation suggests it is a normal vector, so what does that mean?

从记号来看，是一个法向量，那它有什么意义呢？

youdao