OCTA is a Latin prefix meaning 8. The eighth part of the sky. Measuring system of cloud cover, dividing the sky or firmament in eight shares.
Unit of measurement of the cloud cover in the sky. Its value can vary from 0 to ( 41 completely cloudless sky; 8 ( sky completely covered by clouds ) (e) indicates the fraction of the sky covered by clouds.
OCTA:PREFIJO INDICATING EIGHT.