The letter that drives the story
"And God said, Let there be light." "And God saw the light, that it was good." "And the evening and the morning were the first day." In Hebrew, every one of those "and"s is a single waw stuck to the front of the verb — and in this storytelling form it also does something English has no equivalent for: it pushes the verb into past narration. Grammarians call it the waw-consecutive, which is just a technical name for "the and that carries the story." It is the most common letter-as-word in the Bible, and Genesis 1 is built out of it.