It's also known as ground zero or surface zero. It's pretty much the point of impact.
Thirteen point zero zero.
The word name for 210.009 is "two hundred ten point zero zero nine." In this case, the whole number part is "two hundred ten," and the decimal part is read as "point zero zero nine."
Zero point two
zero point two
Zero point nine
six point two zero zero four seven
Seven point zero six.
Point nought nought two or point zero zero two.
Fifteen hundred point zero zero zero. One five zero zero point zero zero zero. One thousand five hundred point zero zero zero.
zero point zero nine three in (inch)
Hundred point zero zero zero or One hundred point zero zero zero
That number is pronounced six point zero two one zero two three.