Memorial window in the Trinity Episcopal Church in Ashland.

By Tim Yockey, 1993. achieve their detail.                          

Triangle in Circle - A symbol of the Eternity (circle) of the Trinity From the altar-quilt in St.Dunstan's Church

Three Fishes. One of the early signs of Christendom was the fish. The Greek word for fish is IXTHUS. This is an acrostic for the Greek words for Jesus Christ, Son of God, Savior. Shows Jesus as part of the Trinity

Triquetra, a symbol of the Holy Trinity. Based on  the sign of the Fish.Found especially in Great Britain. Its three equal arcs represent equality, its continuous line expresses eternity, and the interweaving represents indivisibility.

Trinqueta and a Circle. Triquetra is a symbol of the trinity.

The circle is a symbol of the eternity

Three circles interposed symbolize the unity of the Trinity, yet the separate Persons thereof.

Three Eternal Persons - One Essence

Trinitarian and Triangle, both are symbols of the Holy Trinity

This symbol was used in Spain, to symbolize the Trinity

Three circles interposed, symbolizing the unity of the three Persons. A Triangle symbolizing the Trinity is placed over, revealing the Triquetra sign from the circles. 

The Shield of the Trinity is often used in chatechisms and other forms of Christian education to illustrate the truine nature of the Godhead. The Father (Pater), Son (Filius) and Spirit (Spiritu) are distinct persons, but they are all one God (Deus).

The three curving sides, each exactly equal in length, carry the Latin words, "is not".  The short straight bands have the word "is".  The outer circles bear the words, "Father", "Son", "Holy Spirit", while the inner circle is "God".

The All-Seeing Eye.
This all-seeing eye of God looks out from the triangle of the Trinity.  It is found in some English and Greek churches.

The Circle and Triangle

which suggests the eternity of the Trinity.