Look at enough volume profiles and they start clustering into a handful of recognizable shapes — letters, more or less. A P here, something like a lowercase b there, occasionally a balanced D or a double-humped B.
These aren't labels assigned for fun; each one reflects a distinct pattern of where volume actually built up during a session, and that pattern says something real about how the auction played out, whether it trended, reversed, or found genuine two-sided agreement on price.
This article covers the vocabulary — POC, Value Area, volume nodes — then the shapes themselves, with the main focus on lowercase b: what it means, how it forms, and how it differs from P, D and the easily confused uppercase B.
Key Takeaways
- A lowercase b-shaped volume profile shows greater volume acceptance near the lower part of a range, often after selling pressure or long liquidation.
- The shape describes where trading actually happened, it doesn't independently predict where price goes next.
- Point of Control, Value Area High, and Value Area Low are the three reference points every profile shape gets read against.
- Lowercase b (single distribution weighted low) and uppercase B (two separate distributions) look similar in name only, the underlying market behavior is different.
- Centralized exchange volume and the tick-based volume common in spot Forex measure different things, worth knowing before comparing profiles across markets.
What Is a Volume Profile?
A volume profile is a histogram turned on its side. Instead of showing volume across time along the bottom of a chart, it shows volume across price, plotted vertically — each horizontal bar representing how much trading happened at that specific price level during a chosen session or range.
Why It Looks Like a Skyline
The result looks more like a skyline than a typical bar chart. Some price levels barely register, others tower over their neighbors, and that silhouette is exactly where the letter shapes come from.
A session where trading concentrated near the bottom of its range produces a bottom-heavy silhouette; one that built two separate pockets of heavy trading produces two distinct humps.
The shape isn't decoration — it's a direct visual summary of where the market actually did its business.
Fast Fact
- Market Profile was invented by CBOT floor trader Peter Steidlmayer in the early 1980s to make floor-trading auctions visible to traders off the floor.
Why Price Alone Doesn't Tell You This
A simple line or candlestick chart doesn't show where volume settled. Two sessions can close at the identical price and still tell completely different stories once you look at their volume profiles — one might show broad, even participation across the whole range, the other almost all its volume crammed into one narrow band near the top or bottom.
Reading a Volume Profile: POC, Value Area and the Nodes
Before comparing shapes, the vocabulary needs to be straight. Three concepts do most of the work here, and every shape discussed later gets read against them.
Point of Control (POC)
The single price level where the most volume traded during the session. Visually, it's the widest bar on the histogram, the fattest part of whatever letter shape the profile has taken on.
Traders treat the POC as the price the market found most fair during that period, the level where the most business actually got done.
Value Area High and Value Area Low (VAH / VAL)
The boundaries of the range containing roughly 70% of the session's volume, a convention that traces back to Market Profile itself. Everything between VAH and VAL is where the market spent most of its time and volume, the "accepted" zone.
Price outside that range was tested but not settled into as comfortably, which is why a lot of traders treat excursions beyond VAH or VAL differently than movement inside it.
High-Volume Nodes and Low-Volume Nodes
A high-volume node is any price level where volume built up noticeably more than its neighbors, often acting like a magnet price returns to. A low-volume node is the opposite, a thin patch the market moved through quickly without much trading.
These tend to get revisited fast if price returns to them since there's little to hold it there, price tends to pass through a low-volume node quickly rather than stalling in it.
What a Lowercase b-Shaped Profile Actually Shows
Picture the profile rotated so price runs vertically and volume bars extend sideways. In a b-shaped profile, the wide part of that shape sits toward the bottom of the session's range, tapering into a thinner, narrower band higher up, the visual silhouette resembling the belly and stem of a lowercase b.
Why the Volume Settles Low
This pattern commonly shows up after a session that opened higher, sold off, and then spent the bulk of its remaining time trading and re-trading a lower band of prices. Sellers were in control long enough for the market to build real acceptance down there.
A wave of long liquidation often accelerates this. Traders exiting losing positions as price falls add extra volume into that lower zone, since stopped-out positions are forced sellers regardless of what they'd otherwise choose to do, which is part of why b-shaped sessions frequently coincide with sharp downside moves rather than a slow drift.
What It Doesn't Tell You
A b-shape describes what already happened in that session, not what happens next. It's entirely possible for a session to close with a b-shaped profile and then reverse hard the next day.
Treating the shape as a standalone buy or sell signal skips the actual analytical step, checking what that lower value area means relative to the broader trend, nearby support and resistance, and where liquidity is sitting. The shape is a description of settled business, not a prediction of what comes next.
The Other Shapes, Side by Side
Three other shapes come up often enough to be worth knowing cold, and two of them, lowercase b and uppercase B, get confused constantly despite describing genuinely different market behavior.
P-Shaped Profile
The mirror image of b: volume concentrated near the top of the range with a thin tail below. Forms after a session that trended up and spent most of its later volume near the highs, often following short covering or aggressive buying that built acceptance at elevated prices.
D-Shaped Profile
A single, roughly symmetric distribution centered in the middle of the range, thickest at the POC and thinning evenly toward both VAH and VAL. This is what a balanced, two-sided session typically looks like, no dominant directional pressure, just healthy rotation around a fair value area.
Uppercase B-Shaped Profile (Double Distribution)
This is the one that gets confused with lowercase b constantly, and the distinction matters. An uppercase B profile has two separate high-volume humps with a thin, low-volume gap between them, typically the signature of a session that traded and accepted price in one zone, moved decisively (often on a news event or a session transition), then built a second, separate area of acceptance elsewhere.
It's not "more of the same shape as lowercase b," it's structurally a different pattern: two distinct auctions in one session rather than one lopsided auction.
Reading Shapes Alongside Everything Else
A volume profile shape is one input, not the whole analysis. Reading it in isolation is how the same setup ends up interpreted two different ways by two different traders looking at the identical chart.
The same lowercase b-shaped session means something different depending on where it sits relative to the broader trend, whether it formed at a level that already lines up with support and resistance, and whether the lower value area coincides with a liquidity pocket that's likely to get revisited.
A b-shape forming at the bottom of a multi-week downtrend reads differently than one forming mid-range inside an established uptrend, same shape, different context, different implications.
VWAP adds another layer here. When a session's volume-weighted average price sits inside the value area a b-shaped profile just built, that's added confirmation the lower zone reflects genuine consensus rather than a brief, thin dip that happened to attract volume incidentally.
When VWAP sits well outside that value area instead, it's a signal the session's story is more complicated than the shape alone suggests.
Centralized Exchange Volume vs Spot Forex Tick Volume
The shapes themselves read the same across markets, but what's actually being measured underneath them isn't always identical — and that difference is worth understanding before comparing profiles across instruments.
What Exchange-Based Volume Actually Measures
Worth flagging before applying any of this across markets: a volume profile built from centralized exchange data — futures, most crypto exchanges — reflects actual contracts or coins traded. That's a direct, countable measure of participation.
Why Spot Forex Uses A Proxy Instead
Spot Forex has no single central exchange, so platforms typically substitute tick volume, a count of price changes, as a proxy. It correlates with real activity but isn't the same measurement.
Tools built from historical trading data carry inherent limitations, and that gap between true volume and its Forex proxy is one of the more concrete examples of that limitation in practice.
What This Means For Comparing Shapes Across Markets
Trading a currency pair isn't the same exercise as trading a listed futures contract, and the volume behind each reflects that. Futures and most crypto exchanges hand you a real count, contracts or coins that actually changed hands.
Forex platforms can't, since no single exchange sees the whole market, so tick volume steps in as a stand-in, counting price changes instead of transactions.
The two move together often enough to be useful, but they aren't measuring the same thing. Line up a b-shape from gold futures against one from EUR/USD and you're comparing a hard count to an estimate, not two equivalent readings.
Conclusion
Letters are just a shorthand for where a session's volume actually piled up, bottom-heavy for lowercase b, top-heavy for P, centered for D, split into two separate clusters for uppercase B. But a shape only describes today. It doesn't predict tomorrow, and it's only useful once it's weighed against trend, structure, and liquidity instead of traded on its own, which is exactly why reading about it only gets you so far.
FAQ
Does a b-shaped profile mean price will keep falling?
No. It shows where volume settled that session, not where price goes next. Context, not a signal.
What's the real difference between lowercase b and uppercase B?
Lowercase b is one lopsided distribution weighted low. Uppercase B is two separate distributions with a gap between them, different market behavior entirely.
Can I read volume profile the same way on Forex and crypto?
Not exactly. Centralized exchanges give a real volume count, Forex substitutes tick volume as a proxy. Comparable in concept, not in precision.
What does a low-volume node actually mean?
A price area the market passed through quickly. Little prior activity there, so it tends to get revisited fast.
Is Point of Control the same as VWAP?
No. POC is the single price with the most volume. VWAP is the average across the whole session, a different number that can sit near or far from the POC.
