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In mechanical engineering, chi is used as a symbol for the reduction factor of relevant buckling loads in the EN 1993, a European Standard for the design of steel structures. In graph theory , a lowercase chi is used to represent a graph's chromatic number .
Early symbols similar to the Chi Rho were the Staurogram and the IX monogram (). In pre-Christian times, the Chi-Rho symbol was also used to mark a particularly valuable or relevant passage in the margin of a page, abbreviating chrēston (good). [3] Some coins of Ptolemy III Euergetes (r. 246–222 BC) were marked with a Chi-Rho. [4]
Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. In these contexts, the capital letters and the small letters represent distinct and unrelated entities.
Chrismon Chi-Rho symbol with Alpha and Omega on a 4th-century sarcophagus (Vatican Museums) A Christogram (Latin: Monogramma Christi) [a] is a monogram or combination of letters that forms an abbreviation for the name of Jesus Christ, traditionally used as a religious symbol within the Christian Church. One of the oldest Christograms is the Chi ...
The symbol ϵ (U+03F5) is designated specifically for the lunate form, used as a technical symbol. The symbol ϑ ("script theta") is a cursive form of theta (θ), frequent in handwriting, and used with a specialized meaning as a technical symbol. The symbol ϰ ("kappa symbol") is a cursive form of kappa (κ), used as a technical symbol.
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The labarum (Greek: λάβαρον or λάβουρον [2]) was a vexillum (military standard) that displayed the "Chi-Rho" symbol ☧, a christogram formed from the first two Greek letters of the word "Christ" (Greek: ΧΡΙΣΤΟΣ, or Χριστός) – Chi (χ) and Rho (ρ). [3] It was first used by the Roman emperor Constantine the Great. [4]