The decimal point.
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The period that separates two parts of a decimal is called the decimal point. It distinguishes the whole number part from the fractional part of a number. For example, in the decimal 3.14, the decimal point separates the whole number 3 from the fractional part 14.
Decimal?
To write a decimal you go to the end of the whole number 5 for example and then you put a period (5.) then you add the rest of the decimal like 5.6
You can add a period, and a zero, after the whole number. Or you can just consider the whole numbers themselves a special kind of "decimal number".
8.7. A decimal point (the period in math) says that it's a decimal. A decimal is a fraction of the whole, expressed with the period and means tenths. So the number given is eight wholes and 7/10 of a whole.