The flag of Greece, also known as the "blue and white" or the "sky blue and white," has an aspect ratio of 2:3. It features nine horizontal stripes alternating between blue and white in color. The top and bottom stripes are both blue. In the top left corner, there is a blue square with a white cross inside, which extends over five stripes.

Color codes:

• Blue: Pantone 286 C (Hex: #0D5EAF)
• White: No specific color code, but usually represented as pure white (Hex: #FFFFFF)

Geometric properties and measurements:

• The flag's width-to-length ratio is 2:3.
• The blue square in the upper hoist-side corner covers the first five stripes vertically and occupies two-fifths of the flag's length horizontally.
• The white cross inside the blue square has arms of equal width, each occupying one-fifth of the flag's length.