Ξ

Ξ U+039E, Ξ GREEK CAPITAL LETTER XI ← Ν Greek and Coptic Ο →

Ξ

1. (particle physics) Xi baryon; cascade particle
   • 2017 August 20, Jon Butterworth, “Newly discovered particles, and what's in them”, in The Guardian‎ (in English):

     Those smaller particles are quarks in this case, meaning that the Ξ_cc⁺⁺ is a hadron—the generic name for particles made of quarks.

• Xi (letter) on Wikipedia.Wikipedia

From Phoenician 𐤎 (s, “śāmek”).

Ξ • (X) (uppercase, lowercase ξ)

1. The letter xi (ξεῖ), the tenth letter of the ancient Greek alphabet.

• (Cyrillic) Ѯ
• (Coptic) Ⲝ

• (Greek-script letters) Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, Ω ω
• (non-Classical letters) Ϝ ϝ, Ͷ ͷ, Ͱ ͱ, Ϻ ϻ, Ϙ ϙ, Ͳ ͳ
• (punctuation) · ;
• (diacritics) ᾿ ῾ ◌́ ◌̀ ῀ ¨

Ξ • (X) (uppercase, lowercase ξ)

1. The upper case letter xi (ξι), the 14th letter of the modern Greek alphabet.

• (Greek-script letters) Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, Ω ω
• (non-Classical letters) Ϝ ϝ, Ͷ ͷ, Ͱ ͱ, Ϻ ϻ, Ϙ ϙ, Ͳ ͳ
• (punctuation) · ;
• (diacritics) ᾿ ῾ ◌́ ◌̀ ῀ ¨
• Ξ΄
• ͵Ξ