// Workers AI · dad joke modeWhat did J39 say to J40? You're one greater.
J39 may refer to:
- Elongated pentagonal gyrobicupola, a Johnson solid (J39)
- General Electric J39, a proposed jet engine
- HMS Elgin (J39), a Hunt-class minesweeper of the Royal Navy
- LNER Class J39, a British steam locomotive class
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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