The 2015 Oxford Dictionaries Word of the Year was an emoji — a small digital image that represents an idea; aka, a pictogram.

Emoji are no longer limited to tweets by teen girls; they’re ubiquitous. Even if you don’t use them, you’re likely to run into them, so you may as well know what they mean. Some are unambiguous. Others are more mysterious. And the trickiest emoji seem clear enough — but are often misunderstood.

Scroll through this quiz to test your emoji-savvy, then let us know how many you got right.

Pass? Fail? Share your score in the comments section below.

• Read about “Face with Tears of Joy” — the Oxford Dictionaries’ Word of the Year for 2015
• See our Emoji for Elders starter set (don’t take it too seriously!)