A terminating decimal.
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Assuming that you mean a digit, it is a terminating decimal.
A ray does have a definite beginning, it's point, but it goes on forever in the other direction, which is symbolized by an arrow.
It is 9.
Pi has no definite number of decimal places. It can (theoretically) be written to an infinite number of decimals.
It is an irrational number and as a decimal number it has no ending