The answer is: line quality
I previously entered an answer of 'line movement' but it is in fact line quality
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the unique character of a drawn line as it changes lightness/darkness, direction curvature, or width
Unique line assumption. There is exactly one line passing through two distinct points.
cursor!
It indicates where the "cursor" is: that is where the next character will appear.
In plane geometry, two points determines or defines one unique line.