sefirah
Each of the ten attributes that God created, through which he can project himself to the universe and man.
Other nights, depending on how swanky the function and fashionable the gown, there might also be observed, tattooed in exquisite symmetry below Madame Eskimoff's bared nape, the Kabbalist Tree of Life, with the names of the Sephiroth spelled out in Hebrew, which had brought her more than enough of that uniquely snot-nosed British anti-Semitism
The counting of the Omer, that is, the period of 49 days between Passover and Shavuot.
Where it comes from
From Hebrew סְפִירָה (s'firá, “sefirah”, literally “counting, enumeration”), plural סְפִירוֹת (s'firót).
Adapted from the Wiktionary entry sefirah (CC BY-SA 4.0).