The flag of South Africa has a unique "Y" shape design. The aspect ratio is 2:3. In terms of color and geometric properties, the flag consists of six colors arranged in horizontal, vertical, and diagonal stripes and bands.

Color codes (RGB/Hex):

1. Chili Red - (186, 12, 47) / #BA0C2F
2. White - (255, 255, 255) / #FFFFFF
3. Spectrum Blue - (0, 33, 136) / #002188
4. National Flag Green - (0, 106, 77) / #006A4D
5. Gold - (252, 209, 22) / #FCD116
6. Black - (0, 0, 0) / #000000

Geometric properties:

1. A horizontal red band on top, and a horizontal blue band at the bottom, both extending to the end and separated by a white fimbriation.
2. A green "Y" shape, its arms start close to the left border, extend towards the flag's center, and continue horizontally to the right border.
3. A black isosceles triangle on the left, bordered by a gold stripe, between the upper arm of the "Y" and the upper-horizontal edge of the flag.
4. A blue isosceles triangle on the left, bordered by a gold stripe, between the lower arm of the "Y" and the lower-horizontal edge of the flag.

The flag doesn't have specific measurements for the shapes and stripes, but their proportions should be consistent with the overall aspect ratio of 2:3.