Bollinger Bands SM

This script plots four custom Bollinger Band envelopes on price to map volatility, trend and extremes on a single chart.

What it shows

BB Set 1 – 50-length, 1.25σ (cyan/red)
Short–to–medium-term volatility channel. Good for spotting squeezes, early breakouts and pullbacks in the active trend.

BB Set 2 – 200-length, 1.25σ (lime/yellow)
Higher-timeframe “trend envelope”. When price rides the upper band the trend is strong; closes below the lower band often signal deeper corrections.

BB Set 3 – 14-length, 3.2σ (white/blue, green fill)
Fast, very wide band for short-term volatility spikes. Tags of these outer bands highlight overextended moves that often mean-revert.

BB Set 4 – 200-length, 5σ (white/red, purple fill)
Extreme long-term volatility boundary. Price reaching this zone is rare and can mark exhaustion, blow-off moves or panic washes.

How I use it

Look for squeezes where bands contract tightly before large moves.

Watch for confluence when multiple bands line up as support/resistance.

Treat outer band touches as risk zones, not automatic reversal signals – wait for confirmation from structure or your own system.

This is a visual tool to understand volatility and trend context, not a standalone buy/sell system and not financial advice.