I came across the word ductus today in an interesting article about the origins of the writing. The articles focuses particularly on the development of the Latin/Roman alphabet and traces it’s origins back to ancient Egypt.
Ductus /ˈdʌktəs/ means:
1. the number of strokes that make up a written letter, and the direction, sequence and speed in which they are written
2. a subtle reduction of weight towards the middle of the stroke of the letter
3. (medicine) a duct, tube or canal in the body
Etymology: from Latin, perfect passive participle of dūcō (to lead), from the Proto-Indo-European root *deuk- (to lead), which is also the root of duct, and duke, via the Old French duc and the Latin dux
The article uses it in the second sense when talking about how letters shapes have changed and been simplified over time.
The first sense could be used when talking about Chinese Hanzi / Japanese Kanji / Korean Hanja, as the direction and sequence of strokes used to write such characters is fixed and has to be memorised when learning them, and the number of strokes is used to order them in dictionaries and indices.
Incidentally, I’ve just added a page about the Proto-Sinaitic / Proto-Canaanite script , one of the earliest alphabetic scripts, and one of the scripts mentioned in the article.