The face (◣_◢) has no eyebrows at all. The eyes are two black triangles from the Geometric Shapes block. Their top edges slope down toward the nose, the way brows do when someone frowns. Your brain reads that slope as anger or bad plans.
The parts of (◣_◢)
◣U+25E3Black lower left triangle
_U+005FLow line, the mouth
◢U+25E2Black lower right triangle
Flip the triangles and the mood changes. ◥ and ◤ slope the other way, which is why ◥(ฅº₩ºฅ)◤ reads as a vampire spreading his cloak, not as a frown.
The devil's pitchfork is a Greek letter
Most devil faces hold Ψ or ψ. That is psi, the 23rd letter of the Greek alphabet. It has three prongs on a handle, so it looks like a trident. Typed next to a face, it becomes the pitchfork.
ΨU+03A8Greek capital letter psi
ψU+03C8Greek small letter psi
†U+2020Dagger, used as a cross
The dagger † shows up in exorcist faces like †_(・”・*)β. In print it marks a footnote, but on screen it looks like a small cross.
Evil or angry?
An angry face shouts. ლ(ಠ益ಠლ) has raised arms and an open mouth. An evil face stays calm and plans. (ಠ‿ಠ) uses the same eyes with a small smile, and the smile is what makes it creepy. If you want rage, the angry text faces fit better.
Halloween faces
For October, mix a devil with the pumpkin (﴾ ﴾ ^.,,.^ ﴿) or a vampire like ◥(ฅº₩ºฅ)◤. Emoji have their own versions: 😈 and 👿 for devils and 🎃 for the pumpkin.
Start with eyes that slope down to the middle, like ◣ ◢ or ಠ ಠ. Put a mouth between them and add Ψ for a pitchfork. The builder above does this for you.
What symbol looks like a devil's pitchfork?
The Greek letter psi: Ψ (U+03A8) or the smaller ψ (U+03C8). Many keyboards can type it with a Greek layout, or you can copy it from this page.
What is the evil lenny face?
People use ୧( ಠ┏ل͜┓ಠ )୨ for a lenny face that is plotting something. The ಠ eyes and the ┏ ┓ brows make it look sly. More lenny faces are on the lenny face page.
Why is the vampire called Dracula teeth?
In ಠﭛಠ the middle part is an Arabic letter, ﭛ (U+FB5B). It has four dots below, and they look like fangs, so it reads as a mouth with sharp teeth.