Among the less humorous, and more puerile
things which your average schoolchild
learns to write on his or her calculator
by turning it upside down and typing in the numbers, in reverse order.
Sadly, with the growing proliferation of graphical calculators, this phase will be lost as the pesky little ruffians merely type in obscenities instead. One has swapped the elegant simplicity of 8 numeric character displays for the pixellated extravagance of your average matrix display calculator.
See also - 80087355