Btw i am all for local aliases. I see them most of the times.

i.e, [equation], where a = area of the surface, v= velocity,...

But without short codes it would be a pain to write and remember. Some of the shortening like del operator really reallh simplifies the original expression with better showcase of physical meaning, but looks alien to people who don't know. But we can't stop using it since it makes everything else difficult for people in that area