A non-repeating, non-terminating one.
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Decimal numbers that can't be expressed as fractions are irrational numbers
When a decimal can't be expressed as a fraction then it is an irrational number.
Pi is an irrational number
A decimal rational number can be expressed as a fraction A decimal irrational number can not be expressed as a fraction
An irrational number has a decimal representation that is non-terminating and non-repeating.