The lenses for rangefinder cameras

After the end of world war two, the soviets obtained, between other war compensations, the Carl Zeiss factory of Jena, with it's whole content. After the moving of the factory, the production started again in USSR, with other names. In the beginning, the lenses made from parts moved from Jena had special names, such as ZK (Sonnar-Krasnogorsk).
The lenses produced in soviet union shortly after the end of the war are thus not copies of Zeiss lenses, they are Zeiss lenses!
Alexander Schultz , in his book "Zenit. Die Geschichte mit der russischen Spiegelreflex-Prismensucherkamera M39-Objektivanschluß", explains this way the name "Jupiter": "Zeiss" pronounciation is very close to "Zeus", and "Jupiter" is the roman name of the Greek god "Zeus". He also explains the name "Helios" (sun) by analogy with "Sonnar", forgetting that the Helios 40 and 44 are not Sonnar, they are Biotar lenses. Helios could come from the name of the company which defended the Krasnogorsk factory in 1917.
From: http://www.zenitcamera.com/archive/history/marks.html, automatic translation from Russian to English by Google, adapted.