The APL vendors standardised on using ∊ rather than ∈ (though one implementation uses ∈), but either way, the epsilon should be "lunate" rather than "inverted-3 form" since it derives from the membership symbol.
The convention is that the horizontal bar in ⊖ touches the outer ring. This means the bar has to be elongated compared to -, but this is already the case in ⌿, ⍀, and ⌹, so it is a consistent deviation.
https://github.com/JetBrains/JetBrainsMono/issues/47 added APL symbols, but some of the so-called (former) overstrikes are a little off:
The last two entries need description:
∊rather than∈(though one implementation uses∈), but either way, the epsilon should be "lunate" rather than "inverted-3 form" since it derives from the membership symbol.⊖touches the outer ring. This means the bar has to be elongated compared to-, but this is already the case in⌿,⍀, and⌹, so it is a consistent deviation.For easy look-up, the raw table is here: