NB: More recent documentation for Dyalog APL is available at https://docs.dyalog.com/20.0/.

Primitive Functions

Glyph	Glyph Name	Monadic Function	Dyadic Function
+	Plus Sign	Conjugate	Plus
^			And Lowest Common Multiple
!	Exclamation Mark	Factorial	Binomial
⌈	Upstile	Ceiling	Maximum
○	Circle	Pi Times	Circular
?	Question Mark	Roll	Deal
⊥	Up Tack Symbol		Decode
L			Mix
×	Times Sign	Direction Signum	Times
÷	Divide Sign	Reciprocal	Divide
↓	Down Arrow		Drop
⊂	Left Shoe	Enclose
⊤	Down Tack Symbol		Encode
=	Equal Sign		Equal
~	Tilde	Not	Without
⍀	Slope Bar		Expand First
*	Star	Exponential	Power
⍷	Epsilon Underbar		Find
⌊	Downstile	Floor	Minimum
⍕	Thorn Symbol	Format Monadic	Format Dyadic
⍒	Grade Down	Grade Down Monadic	Grade Down Dyadic
⍋	Grade Up	Grade Up Monadic	Grade Up Dyadic
≥	Greater Than Or Equal To Sign		Greater Or Equal
⊢	Right Tack	Identity	Right
⍳	Iota	Index Generator	Index Of
⌷	Squad Symbol	Materialise	Index
∩	Up Shoe		Intersection
⍸	Iota Underbar	Where	Interval Index
⊣	Left Tack	Same	Left
≤	Less Than Or Equal To Sign		Less Or Equal
⍟	Log	Natural Logarithm	Logarithm
|	Stile	Magnitude	Residue
≡	Equal Underbar Sign		Match
⌹	Domino	Matrix Inverse	Matrix Divide
∊	Epsilon		Membership
-	Minus Sign	Negative	Subtract
⍲	Logical NAND Symbol		Nand
⊆	Left Shoe Underbar	Nest
⍱	Logical NOR Symbol		Nor
≠	Not Equal To	Unique Mask	Not Equal
≢	Equal Underbar Slash	Tally	Not Match
∨	Logical Or		Or Greatest Common Divisor
⊃	Right Shoe		Pick
,	Comma	Ravel
⍴	Rho	Shape	Reshape
⍪	Comma Bar	Table
↑	Up Arrow		Take
⍉	Circle Backslash	Transpose Monadic	Transpose Dyadic
∪	Set Union	Unique	Union