The Swedish flag, known as "Sveriges flagga," features a blue field with a yellow or gold Nordic cross. The design symbolizes Christianity, with the cross representing the influence of the Christian faith in Sweden's history. The blue color is often associated with the sky and lakes, while the yellow represents the sun and fields of grain. The flag's proportions are 5:8, with the vertical part of the cross shifted towards the hoist side. Officially adopted in 1906, the Swedish flag has roots that trace back to the 13th century, reflecting Sweden's rich cultural heritage and national identity.