The initial flag is still in existence. The initial flag of Estonia is stored in Tartu Estonian National Museum. Blue signifies loyalty, as well as country's beautiful blue skies, seas and lakes; black is symbolic of earlier oppression and also the fertile soil; and white represents virtue, Winter season snows, https://zanetdrxh.suomiblog.com/5-easy-facts-about-medieval-banner-flag-described-48873218