Noun
sketchpad (plural sketchpads)
Alternative spelling of sketch pad
Quoting,"For drawings where motion of the drawing, or analysis of a drawn problem is of value to the user, Sketchpad excels. Source: Internet
For highly repetitive drawings or drawings where accuracy is required, Sketchpad is sufficiently faster than conventional techniques to be worthwhile. Source: Internet
Ivan Sutherland developed a pointer-based system called the Sketchpad in 1963. Source: Internet