Looks like "5LS" was the ticker symbol for Solaris Power Cells stock when it traded on the Berlin Stock Exchange. They used to include that info in press releases.
It looks like Solaris also traded on the Stuttgart Stock Exchange via WKN A1W9W5. Best I can tell it last traded on the Stuttgart Exchange on December 18, 2015 (note 18.12.15 under "Realtime" to the right of the chart at the link below).
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