BQN

1. Function

= is for APL Equivalent.

↕: Range/Windows. Outer product of Iotas. Slices of the given size.
≠: Length/Not Equal. = Monadic ≢. = Dyadic ≠.
≢: Shape/Not Match. = Monadic ⍴. = Dyadic ≢.
≍: Solo/Couple. Monadic: Increase the rank with an axis of length 1. Dyadic: Mix the two arguments.
⋈: Enlist/Pair. Monadic: Single element list. Dyadic: Pair in a two element list.
<: Enclose/Lesser Than. Monadic: Unit array (scalar array), = Monadic ⊂.
>: Merge/Greater Than. = Monadic ↑.
∾: Join/Join To. Denest once, without changing the rank. Join along the first axis (Dyadic , does this on the last axis).
↑: Prefixes/Take. List of prefixes. Take portion of the array specifies by the range.
↓: Suffixes/Drop. List of suffixes.
/: Indices/Replicate. Repeat the indices. Repeat the elements.
⊏: First Cell/Select. First major cell (array, possibly a unit array). Major cells at the given indices.
⊑: First/Pick. First Element (the atom). Element at the given index.
⊐: Classify/Index Of. Map to the order of the first occurrences. Index of first occurrence.
⊒: Occurrence Count/Progressive Index Of. Occurrence before. Index of next occurrence each time.
∊: Mark Firsts/Member Of. = Monadic =≠=(Unique Mask), Map first occurrence to 1.
⍷: Deduplicate/Find. = Monadic ∪, Unique major cells. Mark the top left location with 1 if found.
⊔: Group Indices/Group. Group Indices by the values. Group major cells by the given indices.

´: Fold. = /.
`: Scan. = \.
¨: Each. = ¨
˜: Self/Swap. = ⍨
⊸: Bind Left, Before/Dyadic Before. ⟜: Bind Right, After/Dyadic After.
- Bind = ∘x. Dyadic After = ∘f
○: Over. = ⍥.
⌾: Under. f⌾g apply g to both arguments and perform f and then do g⁼=(=g inverse).
⌜: Table. = ∘..