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They are called irrational numbers; numbers that can be expressed as a ratio of integers are called rational numbers. Some common irrational numbers are pi (3.14159...) and the square root of two.
Rational numbers can be expressed as a ratio of two integers, irrational numbers cannot be expressed in that way.
A real number is irrational if it is not rational - meaning it cannot be expressed as a ratio of two integers. Numbers like pi, e, the square root of 5, and uncountably infinite more cannot be expressed as a fraction (ratio) of two integers, and are thus irrational.
The ratio of two integers, p and q where q is not 0, can be expressed as p:q or p/q.
Pi and the square root of two are irrational numbers.