Whilst evaluating the the new ABC navigation, there was disagreement within the UX group as to which icon would be better suited to indicate a sub-menu within the main Navigation on both desktop and mobile.
There is a very good article on buttons and their affordances on UX Movement which I found very useful to determine a baseline in evaluating our solution.
So I ran a couple of remote user tests to validate:
Which icon was more recognised
Which icon was more indicative of the behaviour resulting once clicked / touched
Which icon was deemed more intuitive