Interesting. The close parentheses form of division from 1540 looks like the basis of the long division form of division, i.e. 2)6 with a bar or vinculum, exten

Interesting. The close parentheses form of division from 1540 looks like the basis of the long division form of division, i.e. 2)6 with a bar or vinculum, extending from the top of the parentheses over the 6. The long division form finally takes its modern form in 1888. The transformation of that symbol seems somewhat obvious and natural. I wonder if we are likely to see further changes, as modern typesetting should resist the variations that handwriting would introduce. I believe any change in the future will have to demonstrate improved readability before it will be accepted.