Online Encyclopedia of Western Signs and Ideograms Symbols.com

Symbol 37:1

3701a

3701b

37:1 · These signs are italic forms of the first letter, alpha, in the Greek alphabet. It is used in dozens of technical and scientific systems. British lawyers often mark their folders with this sign to indicate that the case is closed.
    In Christian symbolism 3701b is a stylized fish, a symbol for Jesus. The word fish in Greek is a combination of the initial letters of the name Jesus Christ, Son of God, Saviour.
    For further data see 2640a, another Jesus symbol, in Group 26.