Flappy Icon

>> Is it just me, or are the icons for anger and frustration actually identical? <<

They look identical to me. Illustrations are often reused in icon sets for similar concepts.

>> I ask because when I'm frustrated, everyone around me reads that as anger. If there's really no good way to tell the difference it would explain a lot. <<

There are a handful of basic emotions which can be identified across cultural lines with specific facial markers. The number varies but it is usually 5-8.

Beyond that, it is difficult to distinguish emotions across cultures or with a high degree of statistical accuracy. People often mistake related emotions for each other. This wheel shows how major emotions break down into smaller and smaller subsets. Angry breaks down to aggressive, frustrated, distant, etc. and frustrated breaks down to infuriated and annoyed. I would probably have filed jealous under frustrated.

There are lots of different emotional maps. I like this flower map.

That's why I gravitate to that specific version. Most of the others only have labels. I think the characters make it much more useful. This is the version that Ambrose gave to Shiv for exactly that reason.