I recollect an amusing incident which occurred nearly 40 years ago. At that time, in England, one would head correspondance with the letters Beis Hei in Hebrew, whereas in the United States, they would often use the transliterated equivalent of B.H. One day I received a letter from the U.S. which was headed B.H. and dealt with some Birchas Hamazon booklets I had ordered. I showed the letter to somebody, mentioning that the B.H. stood for B’ezras Hashem. This person, who had never heard of writing B.H. instead of Beis Hei, argued that the B.H. was in fact the sender’s reference, which often appeared towards the top of business letters, to the fact that the letter dealt with booklets for Birchas Hamazon!