I received a letter from a rabbi, in his capacity of leading a Jewish institution, that opened with
Dear _____, LAYT
I assume, given the context, that "LAYT" is some sort of Jewish blessing or honorific. What does it mean?
Kitzur.co.il has the entry
לאורך ימים טובים
LAYT will be the transliteration into English.
Idiomatic Translation - "for a long and good life"
(I normally write LOY”T.)