# Rational numbers

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A **rational number** is a number that can be expressed as the quotient or fraction *p*/*q* of two integers, a numerator *p* and a non-zero denominator *q*. The set of all rational numbers, also referred to as "**the rationals**", the **field of rationals**, or the **field of rational numbers** is usually denoted by a boldface **Q** (or blackboard bold , Unicode U+1D410 𝐐 MATHEMATICAL BOLD CAPITAL Q, or U+211A ℚ DOUBLE-STRUCK CAPITAL Q).^{[1]}