At-bash is a basic "reflective" transformation pattern, wherein the first and last letters of the alef-beit transform into one another, as do the second and second-to-last, and so on.
The name at-bash is a reference to the first two of these transformation pairs: alef-tav and beit-shin.
This is the alphabetic transformation whose elements correspond to the sefirot within the partzuf of binah--Imma.
| At-bash | |
| alef | tav |
| beit | shin |
| gimmel | reish |
| dalet | kuf |
| hei | tzadik |
| vav | pei |
| zayin | ayin |
| chet | samech |
| tet | nun |
| yud | mem |
| kaf | lamed |