BB refers to Bollinger Bands, a popular volatility‑based technical indicator. Since you trade with EMAs, VWAP, and short‑term momentum, this fits naturally into your toolkit.

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📘 What Bollinger Bands Are

Bollinger Bands consist of three lines wrapped around price:

• Upper Band — 20‑period moving average + 2 standard deviations

• Middle Band — 20‑period simple moving average (SMA20)

• Lower Band — 20‑period moving average – 2 standard deviations

They expand when volatility increases and contract when volatility decreases.

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📊 What They Tell You

• Price near upper band → market is stretched upward; momentum strong but overextended.

• Price near lower band → stretched downward; potential exhaustion or continuation.

• Price riding the band → trend continuation (strong trend).

• Price rejecting the band → possible reversal or pullback.

• Squeeze (bands tighten) → volatility compression; often leads to a breakout.

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🔍 In your chart specifically

Your SPY 1‑min chart shows:

• Price is near the lower band (683.80)

• Middle band is 684.17

• RSI is 35 (oversold zone approaching)

• MACD is negative

This combination usually signals downside momentum but nearing short‑term exhaustion—a place where scalpers watch for either continuation or a bounce.

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If you want, I can break down how to combine BB + EMA9 + VWAP for cleaner scalp entries.