The seven and BAR symbols are the high paying symbols. It stands for return to player.
https://talk.hyipinvest.net/threads/310160/
http://www.prepody.ru/topic40678.html
http://webidsupport.4up.eu/forums/showthread.php?tid=327979
http://horsecity.ru/phpBB3/viewtopic.php?f=25&t=185846
http://forum.bandingklub.cz/viewtopic.php?f=21&t=1458933
https://talkingpoints.org/subx/showthread.php?tid=6311
https://www.ww2.site/forum/viewtopic.php?t=114385
https://www.ww2.site/forum/viewtopic.php?t=100400
http://forum3.bandingklub.cz/viewtopic.php...5&t=1328558
https://debate.socialism.nl/forum/showthread.php?tid=183914