@stats_feed Calculators (123 at the bottom):
Calculators inherited their layout from mechanical adding machines and cash registers, where the lowest digits (0-3) were physically closer to the operator for easier access.
@stats_feed Phone Keyboards (123 at the top):
The design of phone keypads originated from rotary dial telephones, where the numbers were arranged from 1 to 9 in a similar top-down order for familiarity.