Fish

This is the plain, generic fish — a side-on silhouette, encoded at U+1F41F in Unicode 6.0. The "generic" matters, because the emoji set gives you several fish and they aren't interchangeable: the brightly striped tropical fish is its own character, as are the puffed-up blowfish and the fishing-rod-with-catch. Reach for 🐟 when you mean fish in the everyday sense — the animal, the food, the zodiac, the pet in a bowl.

Beyond the literal, it does a fair amount of idiomatic work. It shows up for "something smells fishy," for Pisces, for a Friday fish-fry or sushi talk, and occasionally as a stand-in for the Christian ichthys. None of that is baked into the character; it's all context layered onto a fairly neutral picture, which is part of why the generic fish stays broadly useful while the fancier ones stay niche.

Platform rendering is the thing to watch. Most vendors draw a bluish or orange fish, but the exact colour and apparent species differ across Apple, Google, and the rest, so a 🐟 that looks like a goldfish on one phone can look like a mackerel on another. If a specific look matters — a clownfish, say — the dedicated tropical version travels more predictably than hoping the plain fish renders the way you pictured it.