The best icon is a text label — Thomas Byttebier

Previously I wrote about clarity being the most important characteristic of a great interface. Let’s talk about icons now. They’re an essential part of many user interfaces. The thing is: more often than not, they break clarity. Pictograms have been in use since the early days of mankind. They are often seen as the first expressions of a written language. Some non-literate cultures still use them

[teppeis]

"don’t use an icon if its meaning isn’t a 100% clear to everyone."

[ABA]

訳わからんアイコン使わずにテキスト使えという話

[fcicq]

don’t use an icon if its meaning isn’t a 100% clear to everyone.

[yukiyan_w]

見事だ。