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The Ikurriņa has a white cross and a green saltire across a red background. The green St Andrews' cross might represent the Oak of Guernica , a symbol of the old laws of Vizcaya. The white cross represents Catholicism and was also found behind the Oak in the Heraldic arms of Biscay, and the red background represents the Basque people (originally, the Biscaynes). The red background and vertical, horizontal and diagonal lines show some similarity to the coat of arms of the Kingdom of Navarre.