Mustaches are forbidden. Amish men wear their hair long and unparted. For women, cutting and curling of hair is taboo, but it is often braided. Pride is considered a cardinal sin. Having one's picture painted or taken is prohibited.
Cameras are taboo.
This includes all kinds of electrical appliances as well as tractors and automobiles. Horses are the main source of power and transportation. Occasionally, they may make use of stationary gasoline engines. While Amish do not invest in such things as stocks and bonds, they do use banks, take out mortgages, and have checking accounts. They do not believe in insurance or Social Security.