Symbol Zilde

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⍬ — Represents an empty numeric vector or zero plus tilde (hence zilde) — Keystroke Alt + Shift + } — Character ⎕UCS '⍬' = 9068




Symbolically zero or 0 represents number while tilde or represents not. Together the overstrike zilde symbol or means not a number, i.e. empty numeric vector. APL frequently uses overstrike characters in dual-combined meaning, thus which is or prompt and the single quote symbol yielding prompt for string or character input versus or prompt for numeric input.


The above examples for infinity and negative infinity correctly run in NARS2000. In theory ONLY - ⍬ would be hypothetically equivalent to ⍳0 or 0⍴N (where N is any number) since zilde or ⍬ represents an empty numeric vector.

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