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i
Combined from primary sources listed below.

In Terms§

See primary documentation in context for term i

Returns the imaginary unit (for Complex numbers).

In Complex§

See primary documentation in context for postfix i

Adding a trailing i to a number literal makes it a Complex, for example:

say 2i;     # same as Complex.new(0, 2); 
say 1-2e3i; # same as Complex.new(1, -2e3);