I've had trouble researching where the basic concept of a "dozen" comes from, but i suspect it is part of Western culture and not a universal thing. As evidence of this, i offer that things in Japan are usually counted by tens, such as these eggs. I can't remember the last time i saw something sold in groupings of 12 in Japan.
Camera model SGH-T999 Shutter speed 1/15 Aperture f/2.6 Maximum aperture f/2.8 Exposure bias 0.00 Exposure Aperture priority Exposure index 0.0 Focal length 3.7,mm Distance 0.00 m Light source Unknown Flash Off Metering CenterWeightedAverage ISO sensitivity 400