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→Pairing glyphs with their meaning
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<source lang=apl inline>⍺</source> and <source lang=apl inline>⍵</source> are the leftmost and rightmost letters of the [[wikipedia:Greek alphabet|Greek alphabet]]. They therefore denote the left and right arguments of [[dfn]]s, respectively. | <source lang=apl inline>⍺</source> and <source lang=apl inline>⍵</source> are the leftmost and rightmost letters of the [[wikipedia:Greek alphabet|Greek alphabet]]. They therefore denote the left and right arguments of [[dfn]]s, respectively. | ||
<source lang=apl inline>∊</source> is the Greek letter [[Epsilon]] which corresponds to the letter | <source lang=apl inline>∊</source> is the Greek letter [[Epsilon]] which corresponds to the letter ''E'' for [[Enlist]] and [[Element of]]. | ||
<source lang=apl inline>⍴</source> is the Greek letter [[Rho]] which corresponds to the letter | <source lang=apl inline>⍴</source> is the Greek letter [[Rho]] which corresponds to the letter ''R'' for [[Reshape]]. | ||
<source lang=apl inline>~</source> is [[Not]] when monadic, but its dyadic form, [[Without]], can also be remembered as ''but not''. | <source lang=apl inline>~</source> is [[Not]] when monadic, but its dyadic form, [[Without]], can also be remembered as ''but not''. | ||
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<source lang=apl inline>↓</source> [[drop]]s elements, and so it points down, the direction in which things are dropped. Take uses <source lang=apl inline>↑</source> by analogy. | <source lang=apl inline>↓</source> [[drop]]s elements, and so it points down, the direction in which things are dropped. Take uses <source lang=apl inline>↑</source> by analogy. | ||
<source lang=apl inline>⍳</source> is the Greek letter [[Iota]] which corresponds to the letter | <source lang=apl inline>⍳</source> is the Greek letter [[Iota]] which corresponds to the letter ''I'' for [[Index generator]] and [[Index of]]. | ||
<source lang=apl inline>⍸</source> is also the Greek letter [[Iota]] which corresponds to the letter | <source lang=apl inline>⍸</source> is also the Greek letter [[Iota]] which corresponds to the letter ''I'' for [[Indices]] and [[Interval Index]]. | ||
<source lang=apl inline>○</source> is a circle for [[Circular]] functions and the ratio between the circumference and the diameter of a circle, [[Pi times|Pi]]. | <source lang=apl inline>○</source> is a circle for [[Circular]] functions and the ratio between the circumference and the diameter of a circle, [[Pi times|Pi]]. | ||
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<source lang=apl inline>⌈</source> and <source lang=apl inline>⌊</source> can also be seen as indicators on a vertical number line, pointing at the [[maximum]] and [[minimum]], respectively. | <source lang=apl inline>⌈</source> and <source lang=apl inline>⌊</source> can also be seen as indicators on a vertical number line, pointing at the [[maximum]] and [[minimum]], respectively. | ||
<source lang=apl inline>∇</source> is an upside-down Greek [[Delta]], which corresponds to the letter | <source lang=apl inline>∇</source> is an upside-down Greek [[Delta]], which corresponds to the letter ''D'' for [[Defined function]] or (own) definition (for recursion). | ||
<source lang=apl inline>⌸</source> ([[Key]]) applies a function for each collection of all elements that are [[equal]] (<source lang=apl inline>⌸</source>). | |||
<source lang=apl inline>≡</source> can be see as a stack of layers. When used monadically, it finds the [[depth]] of an array. | <source lang=apl inline>≡</source> can be see as a stack of layers. When used monadically, it finds the [[depth]] of an array. | ||