There is no standard “GDP E309” economic indicator. Could you be thinking of:

: This level 3 module explores how primary education is delivered and managed across various global contexts. It examines the influence of international organizations (like the World Bank or UNESCO) on local educational policies.

: Calculated at constant prices (base year prices). It filters out the effects of inflation, providing a true measure of an economy's physical output.

If you want, tell me the country or system where you saw "E309" and I will look up the exact official description and any duties or requirements.