Twinned Glyphs

[ReneZ]

At a different level, also the three glyphs that Stolfi called "circles" (o a y) can be said to share a similar bahaviour (see Emma's discussion You are not allowed to view links. Register or Login to view.).

I like to think of y as the "circle that should be used" when not followed by strings of i .
o and a could also be seen as a pair, though they share only some commonalities and some important differences.