abstract:The labarum () was a vexillum (military standard) that displayed the "Chi-Rho" symbol ☧, formed from the first two Greek letters of the word "Christ" (, or Χριστός) — Chi (χ) and Rho (ρ).In Unicode, the Chi-Rho symbol is encoded at U+2627 (☧), and for Coptic at U+2CE9 (⳩).