> but, while hamburgers are used on a lot of websites and apps, they aren’t universally understood
Again the fashion for extreme flatness, with square icons and buttons that disappear into the background are shown to be counter productive and user hostile.
They might "look nice" to some lead designer, but they don't work as well.
Now, if only Google, Microsoft et al were to wake up to this.
The icons the NHS have used seem to nod to hospital signage too - the arrow, the proportions etc. Probably intentional, working from the same start point, but not mentioned here.