Teheuti
Le Comte de Mellet explains the order thusly,
But like the Egyptian writing which reads to the left or the right,
the twenty-first card, which was not numbered with an Arabic numeral,
is nonetheless also the first, and must be read in the same way in
order to understand the history; as it is the first in the game of
Tarots, and in the species of divination that one performs with these
images.
Lastly, there is a twenty-second card without number as without
power, but which increases the value of that which it precedes; it is
the zero of magic calculations: it is called the Fool.