(
àִèְáִּç
) is not a real word, but a factitious cabalistic term denoting by its very letters the mode of changing one word into another by a peculiar eommutation of letters. The system on which it is founded is this: as all the letters have a numerical value, they are divided into three classes, in the first of which every pair makes the number ten; in the second, a hundred; and in the third, a thousand. Thus:
ãå
,
âæ
,
áç
,
àè
, every pair making ten.
îñ
,
ìò
,
ëô
,
éö
, “a hundred.
úí
,
ùï
,
ø
,
÷åֹ
, “a thousand.
Three letters only cannot enter into any of these numerical combinations,
ä
,
ð
and
êְ
. The first two are nevertheless coupled together; and the last is suffered to stand without commutation. The commutation then takes place between the two letters of every pair; and the term Atbach thus expresses that
à
is taken for
è
, and
á
f or
ç
, and conversely. To illustrate its application, the obscure word
îðåï
, in Pro_29:21, may be turned by Atbach into
ñäãä
, testimony (Buxtorf, De Abbreviaturis, s.v.).