Tab Order Icons - Circles vs Squares

[joflo723]

Something I've always wondered...when in Tab Order view, what is the difference between the circles and the squares?

[Jono_Moore]

It's automatic (circles) vs custom (blue squares) tab order. And green circles signify items on a master page.

It seems odd that you're seeing them on the same page though, when I switch to custom tab order they all turn to blue squares.