To echo Ron I's comment. The VV format is quite simple & offers more info (ie degrees of bullishness & bearishness) at a glance than an always solid or hollow format. They are standard in the sense that red always means a lower close (ie down) & green always means higher (ie up). I think the position of the close relative to the open is important in reflecting sentiment. Solid means it closed below the open (negative) while hollow means it closed above the open (positive). Thus, ignoring the tails, from most bullish to most bearish would be hollow green, solid green, hollow red & solid red. All this at a glance!!!!
To echo Ron I's comment. The VV format is quite simple & offers more info (ie degrees of bullishness & bearishness) at a glance than an always solid or hollow format. They are standard in the sense that red always means a lower close (ie down) & green always means higher (ie up). I think the position of the close relative to the open is important in reflecting sentiment. Solid means it closed below the open (negative) while hollow means it closed above the open (positive). Thus, ignoring the tails, from most bullish to most bearish would be hollow green, solid green, hollow red & solid red. All this at a glance!!!!