Why do some stock symbols have a + sign?

For example, HBM (a mining company) is priced at about $7.00 and HBM+ (the same mining company) is priced at $0.60.

Also, the + ticker has very low volatility and takes a couple of seconds/minutes to send through an order.

I've seen this with a couple of other companies and they all follow similar rules (from what ive seen)

Submitted January 31, 2017 at 10:15AM by PopcornPlayaa_ http://ift.tt/2jQtQbk