One of the symbols used by early Christians (prior to Constantine) to identify themselves to each other, when to be identified as a Christian could result in death.
The symbol of a fish (ΙΧΘΥΣ in Greek) was used, because in Greek the letters of the word are also the first letters of a key Christian concept. I = Ιησυς (Jesus), X = Χριστος (Christ, Messiah, or Anointed one), Θ (the Greek letter theta) = Θεος (God), Υ = Υιος (Son), Σ = Σοτηρ (Savior).
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{{Information| |Description= en:Ichthys '''(Ichtus)''' Icon for Stub One of the symbols used by early Christians (prior to Constantine) to identify themselves to each other, when to be identified as a Christian could result in death. The symbol of a