It defines God as three consubstantial persons, expressions, or hypostases: the Father, the Son (Jesus Christ), and the Holy Spirit.
The triquetra is sometimes used in a Christian context to represent the trinity. These forms of the triquetra often include a circle to emphasize the unity of the three parts of the trinity. It is sometimes called the trinity knot or the trinity circle (when a circle is included), and is most often found in areas of Celtic influence. This means European locations such Ireland but also places were significant numbers of people still identify with Irish culture, such as among Irish-American communities.  The unique interweaving of the Triquetra symbolizes unity and indivisibility. The Triquetra, as a symbol of the Trinity was used commonly by the Celtic Christian Church and sometimes represented by three interlaced fish within a circle representing unity. The idea of the Trinity is expressed in a number of verses of the Bible which includes Matthew 3:16-17 and John 14:16-17; among others.  All you need to know about the Trinity Knot symbol which is commonly associated with the wonderful Emerald Isle. The celtic trinity knot is also referred to as the Triquetra meaning a three-cornered shape. It is a popular feature in Celtic art, more specifically in Insular art. Read a selection of facts and useful information about the trinity knot symbol including its meaning and origin. In the name of the Father and of the Son and of the Holy SpiritThe grace of the Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with all of you.. Trinity Symbol. Celtic Trinity Knot Celtic Symbol-Image The image below shows a simple Triquetra. The Christian doctrine of the Trinity (from Latin trinitas triad, from trinus threefold) defines God as three consubstantial persons, expressions, or hypostases: the Father, the Son (Jesus Christ), and the Holy Spirit; one God in three persons.  Triquetra (/traɪˈkwɛtrə/ ; Latin tri- three and quetrus cornered) originally meant  triangle  and was used to refer to various three-cornered shapes. The triquetra has been found on runestones in Northern Europe and on early Germanic coins. It presumably had pagan religious meaning and it bears a resemblance to the Valknut, a symbol associated with Odin. Celtic Trinity Symbol and Triquetra Meaning. The Celtic symbol for trinity has a myriad of symbolic meaning. We see the trinity motif in Celtic knots, as well as in symbol-form like the triquetra and triskelion (a.ka. triskele or fylfot). To the ancient Celtic mind, it may also signify the lunar or solar phases.  The Celtic Trinity Knot, or the Triquetra, is one of the most common of the knot ilk. The term Triquetra comes from Latin, and it means three-cornered.. There are many schools of thought when discussing the Celtic trinity knot meaning. The Celtic knot symbol, is also referred to as the mystic knot, or the endless knot. The more esoteric or spiritual meaning of this symbol eludes to beginnings and endings. In viewing these beautiful knots, we cannot see a beginning or and end, and therefore we are reminded of the timeless nature of our spirit.
http://altreligion.about.com/od/symbols/p/Triquetra.htm http://www.innovateus.net/innopedia/what-does-symbol-triquetra-mean http://www.theemeraldisle.org/celtic-symbols/celtic-trinity-knot.htm https://en.wikipedia.org/wiki/Trinity https://en.wikipedia.org/wiki/Triquetra http://www.whats-your-sign.com/celtic-symbol-for-trinity.html http://www.whats-your-sign.com/celtic-knots.html
what does the trinity symbol mean