Diasystolic blood pressure
Wrist blood pressure monitors.

Normal diasystolic pressure is around 80, high over 90

But what is diasystolic blood pressure?

Simply this lower reading when your blood pressure is taken reflects the amount to which blood pressure drops while your heart is refilling after it has pumped blood.

If you listen to a heart it makes a lup-dup sound.
diasystolic blood pressure is the "dup"

More detail on blood pressure readings