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<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. | ||
<source lang=apl inline>≢</source> looks like a [[tally]] mark. | <source lang=apl inline>≢</source> looks like a [[tally]] mark. It being sideways can be justified by it counting the length of the leading axis; the vertical axis of a matrix. | ||
<source lang=apl inline>⊂</source> [[enclose]]s its argument in a layer of nesting, and [[Disclose]] uses <source lang=apl inline>⊃</source> by analogy. <source lang=apl inline>⊆</source> is exactly like <source lang=apl inline>⊂</source> except that it only does a [[conditional enclose]], namely only if the argument is [[simple]]. | <source lang=apl inline>⊂</source> [[enclose]]s its argument in a layer of nesting, and [[Disclose]] uses <source lang=apl inline>⊃</source> by analogy. <source lang=apl inline>⊆</source> is exactly like <source lang=apl inline>⊂</source> except that it only does a [[conditional enclose]], namely only if the argument is [[simple]]. |