Whether the banks that sell options will slow price moves down or speed them up.

Dealers buy dips and sell rallies, so moves tend to get absorbed.

Dealers sell into drops and buy into rallies, so moves tend to run further.

The price where dealer gamma switches between positive and negative.

A strike with a lot of dealer gamma, where price tends to slow down or stick.

How many option contracts are open at a strike right now.

Puts compared with calls — a rough read of how defensive options traders are.

How big a move the options market is pricing in.

The range the options market prices for a given expiry.

How much more downside protection costs than upside bets.

The expiry price at which the most options would expire worthless.

Other measures of how dealer hedging shifts with price, volatility and time.

The price range where 70% of the session's volume traded.

The single price with the most volume — the market's "fair price" so far.

The top and bottom edges of the value area.

A past session's POC that price has not traded back through since.

Thick shelves of volume (HVN) and thin pockets between them (LVN).

Today's volume compared with a normal day at the same time.

Price outside value on light volume — a move nobody is backing.

The day session when most of a market's volume trades.

Futures trading outside the main session, from 6 PM ET.

The range of the first hour of the main session.

A day that keeps moving one way and closes near its extreme.

A day that rotates inside a range instead of trending.

The jump between yesterday's close and today's open, and whether price trades back to close it.

How far a market normally moves in a day.

What you would score by always guessing the more common direction.

How often a call got the direction right.

A rule that beats the base rate by more than luck would explain.

Replaying a rule over past data to see how it would have done.

Calls made before the outcome was known, graded afterwards.

How many calls a result is based on.

How much price has actually been moving.

Whether price is going somewhere or back and forth.

How a sector or stock is doing compared with the index.

The gap between the best bid and offer — the cost of getting in and out.

Trading against a move — selling strength or buying weakness.

The price that proves the idea wrong, where you get out.

The short code for a futures market, and its smaller version.