least significant digit; LSD
Computing term for the rightmost digit in a number, which has the smallest place value.
Truncating the least significant digit can sometimes reduce precision.
最大有効数字 is the most significant digit (MSD), the leftmost digit with the highest place value, opposite of 最小有効数字.
Compound of 最小 (smallest) + 有効 (effective) + 数字 (digit), a direct translation of the English computing term 'least significant digit'.