The Basics of Judaism: G-d & Torah: Not spelling out "G-d":
Why do we write "G-d" instead of spelling it out?
We're concerned that a document containing G-d's Name
might not be treated respectfully, so we don't spell
out the Name in full. Using an abbreviation isn't
disrespectful; it's like using "Dr." for "Doctor".
Furthermore, we're using the abbreviation for a
respectful reason: to avoid putting the Name in a
position where it might be treated disrespectfully.
Using substitutes for Divine Names is an old Jewish
tradition; the Tetragrammaton is never pronounced
nowadays (it was pronouced by the priests when the
Temple existed), but is replaced by "My L-rd", and
even the replacement is used only for sacred purposes.
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