δ (EN)

letter, symbol

letter “δ”

1. the 4th letter of the Greek alphabet
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   The teacher wrote the letter δ on the blackboard.

symbol “δ”

1. (astronomy) declination; the angular distance of a celestial object north or south of the celestial equator
   The astronomer noted the star's right ascension and δ.
2. (mathematics) any small value or change of value
   The physicist wrote δ in the equation to represent a small change.