This symbol, which looks like a dollar sign ($), is actually the letters I, H, and S superimposed over each other. These represent the Greek letters Iota (Ι), Eta (Η) and Sigma (Σ), which are the first three letters of Jesus in Greek. See IHS Monogram for more information.

Photo: from the grave marker of Atala Blow Noble (1862-1909) and Louis S. Noble (1865-1934), Fairmount Cemetery, Denver, Colorado
Posted by Joe
Alpha (A) and Omega (Ω) are the first and last letters of the Greek alphabet. The Christian symbol juxtaposing the two letters is derived from the book of Revelation: “I am Alpha and Omega, the beginning and the end, the first and the last” (Revelation 22:13). You will sometimes see it used with the Chi Rho (PX) symbol.
The monogram that looks like a combination of a P and an X is actually the first two letters of the Greek word for Christ – Chi (X) and Rho (P). The symbol was used by early Christians and is attributed to the Roman Emporer Contstantine, who used it as a military symbol. You will often see it on banners, called labarum, in ecclesiastical processions. The Chi Rho symbol is also the origin of using the abbreviation Xmas for Christmas.




