Star of David (the emblem of the World Zionist Organization) on a Hebrew sign above the entrance to Herzl Mount notifying the public about the events to commemorate 110 years since the first Zionist Congress.
This blog (by Zeev Barkan) is dedicated to the Star of David, its history, its various meanings and usages in different cultures. It includes thousands of pictures of Star of David, six-pointed stars, hexagrams, Solomon's Seals, Magen Davids and yellow badges,and served as a resource for three books and four art exhibitions.
Menorah surrounded by a Magen David in the emblem of the World Zionist Organization, as it appears above the entrance to Herzl Mount. Menorah is one of the emblems that most frequently accompany the Magen David.
Gideon from the Israeli collector’s forum “collect” referred me to this rare stamp from the Period of Napoleon 3rd and wrote to me that the cancel is made from dots formed in the shape of a hexagram, and that the postal stamp was issued on1869 . It was used in the French colonies.

Thanks to Gideon from the Israeli Stamp collector’s Forum “collect” for referring me to this stamp, which is the first round stamp I've ever seen. Gideon taught me that there are even stamps that are not made from paper.
The three six pointed stars above the central star symbolize the three main islands - Tongatapu,Vava'u and Ha'apai.
Cross inside six-pointed star is part of the Tongan Coat of Arms shown on the obverse of 1962 Tonga gold coin; reverse shows Queen Salote Tupou III
Picture is courtesy of Gideon from "Collect"
Photo of a green six-pointed star surrounding a white Lauburu is courtesy of "erikrasmussen" who shot it in Mondragon in Gipuzkoa province, Basque Country, Spain, and published it on Flickr. Erikrasmussen wrote on his blog that the Lauburu is a swastika but according to Wikipedia Lauburu is the Basque Cross which has four arms, shaped like a comma.