Israel

The flag of Israel was officially adopted on 28 October 1948. It is a white banner with three blue (tekhelet) symbols: a pair of horizontal tallit-like stripes above and below a centred Star of David. Relevant Israeli legislation describes the flag's dimensions as 160 cm (63 in) by 220 cm (87 in), thereby fixing the proportion to a ratio of 8:11. But variants can be found at a wide range of proportions, with 2:3 also common.

The Provisional Council of State Proclamation of the Flag of the State of Israel reads: The flag is 220 cm. long and 160 cm. wide. The background is white and on it are two stripes of dark sky-blue, 25 cm. broad, over the whole length of the flag, at a distance of 15 cm. from the top and from the bottom of the flag. In the middle of the white background, between the two blue stripes and at equal distance from each stripe is a Star of David, composed of six dark sky-blue stripes, 5.5 cm. broad, which form two equilateral triangles, the bases of which are parallel to the two horizontal stripes. Although the stripes are described as a "dark sky-blue" and the Shield of David as simply "sky-blue", the two elements of the flag are almost always the same shade. In Hebrew, the blue is described as תְּכֵלֶת‎ tḵēleṯ, which traditionally refers to a dark sky-blue dye identical to indigo—so identical in fact that supposedly only God could distinguish between them—and which was extracted from a sea creature called a חִלָּזוֹן‎ ḥillāzōn (almost certainly the banded dye-murex, from which a dye chemically identical to indigo can be extracted). But flags with vastly differing shades of blue are…