The Star of David or Shield of David (Magen David in Hebrew, מָגֵן דָּוִד with nikkud or מגן דוד without, academically transcribed Māḡēn Dāwīḏ by Biblical Hebrew linguists, [maˈɡen daˈvid] in Modern Hebrew and Mogein Dovid [ˈmɔɡeɪn ˈdɔvid] or Mogen Dovid [ˈmɔɡen ˈdɔvid] in Ashkenazi Hebrew and Yiddish) is a generally recognized symbol of Jewish identity and Judaism.
It is named after King David of ancient Israel; and its earliest known communal usage began in the Middle Ages, alongside the more ancient symbol of the menorah. Geometrically it is the hexagram.
In the Jewish prayer book, the term "Shield of David" (but not the symbol) appears at the end of the "Samkhaynu/Gladden us" blessing, which is recited after the reading of the Haftara portion on Saturday and holidays. The term refers directly to God, who shielded the Biblical David in battle and during his flight from Saul. The term may be loosely based on Psalm 18, which is attributed to David, and in which God is compared to a shield (v. 31 and v. 36).
A similar term, "Shield of Abraham" appears in the first blessing of the "Amidah" prayer, which was written in early Rabbinic times (around year 1, a millennium before the first documentation of the term in reference to a six-point star). That term is probably based on Genesis 15:1, where God promises to shield Abraham.
Without knowing when the Haftara blessings originated, it is difficult to know whether the term "Shield of David" pre-dated the symbol. If so, the term "Shield of David" originally referred to God, and somehow became attributed to a six-point star.
A popular folk tale etymology has it that the Star of David is literally modeled after the shield of the young Israelite warrior David, who would later become King David. In order to save metal, the shield was not made of metal but of leather spanned across the simplest metal frame that would hold the round shield: two interlocking triangles. No reliable historical evidence for this etymology exists; this theory is refuted by a credible tradition that there was a Menorah engraved upon the shield which King David used in wartime.
According to Judaic sources, the Star or Shield of David signifies the number seven: that is, the six points plus the center. The earliest known text related to Judaism which mentions the symbol is Eshkol Ha-Kofer by the Karaite Judah Hadassi, in the mid-12th century CE:
The number seven has religious significance in Judaism, e.g., the six days of Creation plus the seventh day of rest, the six working days in the week plus Shabbat, the Seven Spirits of God, as well as the Menorah in the ancient Temple, whose seven oil lamps rest on three stems branching from each side of a central pole. Perhaps, the Star of David came to be used as a standard symbol in synagogues because its organization into 3+3+1 corresponds to the Temple's Menorah, which was the more traditional symbol for Judaism in ancient times. There are also six words in the Shema, the most important prayer in Judaism, and it is not uncommon to find the Shema written around a Star of David.
In Kabbalah, the Star of David symbolizes the six directions of space plus the center, under the influence of the description of space found in the Sefer Yetsira: Up, Down, East, West, South, North, and Center. Congruently, under the influence of the Zohar, it represents the Six Sefirot of the Male (Zeir Anpin) united with the Seventh Sefirot of the Female (Nukva).
Some Kabbalistic amulets use the symbol to arrange the Ten Sefirot. However, reference to the symbol is nowhere in the classical kabbalistic texts themselves, such as the Zohar and the like. Therefore, its use as a sefirotic diagram in amulets is more likely a reinterpretation of a preexisting symbol.
According to G.S. Oegema -
"Isaac Luria provided the Shield of David with a further mystical meaning. In his book Etz Chayim he teaches that the elements of the plate for the Seder evening have to be placed in the order of the hexagram: above the three sefirot "Crown", "Wisdom", and "Insight", below the other seven".
Similarly, M. Costa wrote that M. Gudemann and other researchers in the 1920s claimed that Isaac Luria was influential in turning the Star of David into a national Jewish emblem by teaching that the elements of the plate for the Seder evening have to be placed in the order of the hexagram, but Gershom Scholem proved that Isaac Luria talked about parallel triangles one beneath the other and not about the hexagram. The Star of David at first was only known remotely and would not be considered 'official'. At the time the nearest thing to a Jewish symbol would be a menorah.
The Shield of David is not mentioned in ancient rabbinic literature. A supposed Shield of David however has recently been noted on a Jewish tombstone at Taranto, in Southern Italy, which may date as early as the third century CE. Likewise, a stone bearing the Shield from the arch of a 3-4th century synagogue in the Galilee was found. 
The earliest Jewish literary source which mentions the "Shield of David" is the Eshkol Ha-Kofer by Judah Hadassi from the middle of the 12th century CE, where seven Shields are used in an amulet for a mezuzah. It appears to have been in use as part of amulets before it was in use in formal Jewish contexts. A manuscript Tanakh dated 1307 and belonging to Rabbi Yosef bar Yehuda ben Marvas from Toledo, Spain, was decorated with a Shield of David. In the synagogues, perhaps, it was associated with the mezuzah. Originally, the hexagram may have been employed as an architectural ornament on synagogues, as it is, for example, on the cathedrals of Brandenburg and Stendal, and on the Marktkirche at Hanover. A pentagram in this form is found on the ancient synagogue at Tell Hum.
In 1354, King of Bohemia Charles IV prescribed for the Jews of Prague a red flag with both David's shield and Solomon's seal, while the red flag with which the Jews met King Matthias of Hungary in the 15th century showed two pentagrams with two golden stars. The pentagram, therefore, may also have been used among the Jews as early as the year 1073.
In 1460, the Jews of Ofen (Budapest, Hungary) received King Matthias Corvinus with a red flag on which were two Shields of David and two stars. In the first Hebrew prayer book, printed in Prague in 1512, a large Shield of David appears on the cover. In the colophon is written: "Each man beneath his flag according to the house of their fathers... and he will merit to bestow a bountiful gift on anyone who grasps the Shield of David." In 1592, Mordechai Maizel was allowed to affix "a flag of King David, similar to that located on the Main Synagogue" on his synagogue in Prague. In 1648, the Jews of Prague were again allowed a flag, in acknowledgment of their part in defending the city against the Swedes. On a red background was a yellow Shield of David, in the center of which was a Swedish star.
The Star of David can be found on the tombstones of religious Jews going back hundreds of years in Europe, as it became accepted as the universal symbol of the Jewish people. Following Jewish emancipation after the French revolution, Jewish communities chose the Star of David to represent themselves, comparable to the cross used by most Christians.
The vast majority of Spanish and Portuguese Jews do not use the star either. This probably reflects the trends before the forced conversion in Portugal and also its use is Spain. Their symbols are connected with the survival from the Inquisition, like the bird Phoenix.
Many Modern Orthodox synagogues, and many synagogues of other Jewish movements, however, have the Israeli flag with the Star of David prominently displayed at the front of the synagogues near the Ark containing the Torah scrolls.
The star is usually in blue, as on the flag of Israel.
In the endocrine system, Anahata is associated with the thymus gland, located in the chest. This gland produces white blood cells, that combat disease, and bring equilibrium to the body. The functioning of the thymus is greatest before puberty and is impaired by the appearance of sex hormones in the blood stream from puberty onwards.
Many Western occultists associate this central chakra with the central sephirah, Tiphereth, in the kabbalistic tree of life. Christian kabbalists in particular associate this sephirah with love, healing and Jesus Christ as God the Son.
The Shatkona is a symbol used in Hindu yantra that represents the union of both the male and feminine form. More specifically it is supposed to represent Purusha (the supreme being), and Prakriti (mother nature, or causal matter). Often this is represented as Shiva - Shakti.
The Star of David is identical to the ancient emblem of Tamil God Murugan, also known as the God with Six Faces.
||Anahata, or Anahata-puri, or padma-sundara is related to the thymus, located in the chest. The thymus is an element of the immune system as well as being part of the endocrine system. It is the site of maturation of the T cells responsible for fending off disease and may be adversely affected by stress. Anahata is symbolised by a lotus flower with twelve petals. (See also heartmind). Anahata is related to the colours green or pink. Key issues involving Anahata involve complex emotions, compassion, tenderness, unconditional love, equilibrium, rejection and well-being. Physically Anahata governs circulation, emotionally it governs unconditional love for the self and others, mentally it governs passion, and spiritually it governs devotion.|
A Star of David, often yellow-colored, was used by the Nazis during the Holocaust as a method of identifying Jews. After the German invasion of Poland in 1939 there were initially different local decrees forcing Jews to wear a distinct sign – in the General Government e.g. a white armband with a blue Star of David on it, in the Warthegau a yellow badge in the form of a Star of David on the left side of the breast and on the back. The requirement to wear the Star of David with the word Jude (German for Jew) inscribed was then extended to all Jews over the age of 6 in the Reich and the Protectorate of Bohemia and Moravia (by a decree issued on September 1, 1941 signed by Reinhard Heydrich ) and was gradually introduced in other German-occupied areas, where local words were used (e.g. Juif in French, Jood in Dutch).
Magen David Adom (MDA) (Red Star of David or, translated literally, Red Shield of David) is Israel's only official emergency medical, disaster, ambulance service. It is an official member of the International Committee of the Red Cross.
Star of David
[[File:|thumb|left|135px|The Flag of Israel, showing the Magen Dawid]] The Star of David (Hebrew:מָגֵן דָּוִד, or Māġēn Dāwīd, pronounced ['mɔ.gen dɔ.vid] in ancient Hebrew, and ['mɑː.gen dɑːvɪd] in Modern Hebrew) is a Jewish symbol. It is named after King David of Israel. It is very famous. The star consists of a triangle, overlapped by another, "upside-down" triangle. It is unknown how this came to be a symbol of Judaism, but it was first used in the Middle Ages. It is used on the flag of Israel, and was used by German National Socialists to identify Jews.