Banknote Security Feature

I'm so absorbed in this Star of David blog thing that I start seeing this symbol wherever I go. For example, today I paid in a store with a banknote of 20 NIS and saw a Star of David on it. The banknote carried the Portrait of Moshe Sharett, Israeli foreign minister at the time of Israeli Independence Declaration . At the left side of the banknote I noticed an excerpt from a speech with too-small Hebrew fonts, but I succeeded reading the words "This Magen David".
When I returned home I browsed the Israel Bank website and found that on the Second Series of the New Shekel there's a "See-through: A small triangle printed on either side of the note; the two triangles form a precise Star of David".