I read through the article and comments on "We need a standard show navigation icon for responsive web design" by Andy Clarke and it got me thinking about the subject and I'd like to hear your opinion.
I believe with the word "Menu" along with any of the mentioned icons ("plus sign", "grid icon", "down arrow", "three line icon" or "unordered list icon") will work, but what about just the icon on its own?
I think the three line icon many designers seem to prefer is too ambiguous. It doesn't tell me enough about what it'll do when it's interacted with. I know it's being used more and more to be a "show menu" button but is it clear enough for people not familiar with it?
I have no idea what to expect if I click a grid icon.
The add icon I can see getting confused with an "add" action easily.
The unordered list icon has the same issue as the thee line icon ( in my opinion ).
I prefer the down arrow if I'm limited to just the icon. It typically points to where you expect the additional information to appear which is what you're doing.
What are your thoughts?