The Formula of Concord (Ep, Summary Rule, 4) already refers to the Augsburg Confession as "our symbol for this time" (dieser Zeit unserem Symbolo). The use of the term "symbol" for creed goes back at least as far as the Council of Chalcedon (451), which refers to the Nicene Creed as a "symbolon." Latin usage was similar: Augustine's "On Faith and the Creed" is in the Latin original "De Fide et Symbolo" (393). Pelikan, in his book "Credo" (p. 7) simply says the the Greek symbolon and the Latin symbolum were, with "regula fidei", among the earliest terms for creeds. The Catechism of the Catholic Church (para. 188) explains: "The Greek word symbolon meant half of a broken object, for example, a seal presented as a token of recognition. the broken parts were placed together to verify the bearer's identity. the symbol of faith, then, is a sign of recognition and communion between believers. Symbolon also means a gathering, collection or summary. A symbol of faith is a summary of the principal truths of the faith and therefore serves as the first and fundamental point of reference for catechesis."
Michael (wasting time after dinner rather than getting to work) Root