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APL characters render oddly in some fonts.
Top Answer
`+⌿÷≢` +⌿÷≢

0.1+-×÷⌈⌊*⍟|!○~∨∧⍱⍲<≤=≥>≠ .@≡≢⍴,⍪⍳↑↓?⍒⍋⍉⌽⊖∊⊥⊤⍎⍕⌹⊂⊃∪∩⍷⌷∘→←⎕⍞/⌿\⍀À¨⍣&⍨⌶#⊆⍥⊣⊢⍠⍤⌸⌺⍸()[];⋄:⍬{}∇⍝

≢ often renders as ≡/


> **APL** (named after the book _A Programming Language_)^[2]^ is a programming language developed in the 1960s by Kenneth E. Iverson. Its central datatype is the multidimensional array. It uses a large range of special graphic symbols^[3]^ to represent most functions and operators, leading to very concise code. It has been an important influence on the development of concept modeling, spreadsheets, functional programming,^[4]^ and computer math packages.^[5]^ It has also inspired several other programming languages.^[6][7]^
xtimes←{⎕IO←0  ⍝ Fast multi-digit product using FFT.
    extend←{(2*⌈2⍟¯1+(⍴⍺)+⍴⍵)↑¨⍺ ⍵}
    FFT←{,(cube roots⍴⍵)floop cube ⍵}
    iFFT←{(⍴⍵)÷⍨,(cube+roots⍴⍵)floop cube ⍵}
    rconvolve←{(¯1+(⍴⍺)+⍴⍵)↑iFFT⊃×/FFT¨⍺ extend ⍵}
    carry←{1↓+⌿1 0⌽0,0 10⊤⍵}
    (+/∧\0=t)↓t←carry⍣≡0,⌊0.5+9○⍺ rconvolve ⍵

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