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Reference.org
Subnormal number
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<p>In <a href="/facts/Computer_science/lN3pEyPz">computer science</a>, subnormal numbers are the subset of denormalized numbers (sometimes called denormals) that fill the <a href="/facts/Arithmetic_underflow/7FM8yHvs">underflow</a> gap around zero in <a href="/facts/Floating-point_arithmetic/eIckahxe">floating-point arithmetic</a>. Any non-zero number with magnitude smaller than the smallest positive <a href="/facts/Normal_number_(computing)/5pvlHVvg">normal number</a> is <i>subnormal</i>, while <i>denormal</i> can also refer to numbers outside that range. </p>