Price never moves in straight lines — it advances, pulls back, advances again. Each turning point is a swing: a swing high where a rise reverses, a swing low where a fall reverses. Zoom out on any chart and it's only swings — everything else (indicators, patterns, moving averages) is math derived from these turning points. Structure trading reads the source directly.

The alphabet has four letters. In a rising market: each rally exceeds the last peak — a Higher High (HH) — and each pullback bottoms above the last trough — a Higher Low (HL). In a falling market, the mirror: Lower Highs (LH) and Lower Lows (LL).

This gives you the first objective definition of trend you've probably ever had: an uptrend IS a sequence of HH+HL; a downtrend IS a sequence of LH+LL. Not "price above some average," not a feeling — a checkable, yes/no pattern of swing labels. When neither sequence holds (highs and lows overlapping sideways), you have a range — the third state, and Chapter 15's whole subject.

Now connect the alphabet to Modules 1–2, because this is where structure stops being lines and becomes behavior. A Higher Low is a behavioral event: price fell, and buyers stepped in before it reached the previous trough — someone was willing to pay up earlier this time. Repeated HLs = repeated evidence of demand arriving progressively sooner = the queue-eating of Chapter 2 tilted persistently one way = frequently the sliced, patient buying of Chapter 7's institutions, printed on the chart. The alphabet is literally participant behavior, compressed.

Two disciplines that keep the alphabet honest: pick a swing rule and keep it — decide what counts as a swing on your timeframe (e.g., a high flanked by lower highs on both sides, or a minimum % move) so your labels aren't mood-dependent; and respect the fractal problem — a 5-minute downtrend lives inside a daily uptrend routinely, so structure labels are always timeframe-stamped: "HH on the hourly" is a complete sentence, "HH" alone is not.

Key Takeaway

Trend has an objective definition: the swing sequence. HH+HL = uptrend, LH+LL = downtrend, neither = range. Every label is a behavioral fact about where buyers/sellers stepped in — and it's only meaningful with a timeframe attached.

Think About It

Take your last discretionary "the trend is up" call. Could you have proven it with swing labels — or was it a feeling wearing a chart's clothes?

Structure Lab — Label 50 Swings

Open any daily chart on tradingview.com (free), pick one liquid stock or Nifty, hide ALL indicators, and manually mark every swing high/low over 6 months, labeling each HH/HL/LH/LL. Do this for 3 charts. It's tedious exactly once — after ~50 labels, your eye does it automatically forever, and you'll have acquired the school's core skill.