Another view of the Star of David locates its meaning in the name David itself. In Hebrew spelling (דוד), David contains only three characters, two of which are “D” (or “Dalet,” in Hebrew). In ancient times, this letter was written in a form much like a triangle, similar to the Greek letter Delta (Δ). Thus, the symbol may have been a family crest formed by flipping and juxtaposing the two most prominent letters in the name.
– Star of David, New World Encyclopedia