Complex sentence: In computer science, denormal numbers or denormalized numbers (now often called subnormal numbers) fill the underflow gap around zero in floating point arithmetic: any non-zero number which is smaller than the smallest normal number is'sub-normal'.
Split into simpler sentences: In computer science, denormal numbers or denormalized numbers (now often called subnormal numbers) fill the underflow gap around zero in floating point arithmetic. Any non-zero number with magnitude smaller than the smallest normal number is'sub-normal'.