Lambda
Astronomical nomenclature
 Lambda Geminorum, a star
 Lambda Paz, a moon

Classifications
 Janeway Lambda One, a holodeck program
 "Janeway-lambda-3", a security code
 Lambda (classification), a classification in the mirror universe
 Lambda sequence, evasive maneuver used by Kathryn Janeway against the Kazon
 "Tuvok-1-4-9-4-lambda", a security clearance code

Physics
 Lambda field generator, a generator that produced a lambda field

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