lexicring
⿽十邱
⿽十邱 is a binary operator that evaluates the sum of lengths of English names of each number.
For example, 1 ⿽十邱 1 = 6 since "one" is three letters long.
The operator ⿽十邱 is notably used in "Black Magic"1 games as a means to sow confusion.
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A genre of games with "hidden rules". ↩