A small circle at one end of a figure indicates the maneuver starting point. A short vertical line at the other end of the figure indicates the maneuver end point. Horizontal segments represent level flight paths (flown left to right in this example). All aerobatic figures start and end from horizontal lines in either upright or inverted flight.  Solid lines describe upright flight, dashed lines describe inverted flight. 

Vertical segments indicate vertical flight paths.
The corners are intended to be flown as 1/4 loops, not right angles.
Segments angled 45° indicate flight at a 45° angle from the vertical.
Circles (and portions of circles) indicate loops (and loop portions).
Roll Short arcs with arrows drawn to intersect lines indicate full aileron rolls.
Point Roll Portions of arcs (approx. 90°) drawn on one side of a line indicate portions of rolls. As drawn, the figure depicts a 1/2 roll performed in horizontal flight. The number 4 indicates a four point hesitation roll. The 2/4 above shows this figure will be flown starting upright, then 2 points of the 4 points roll to inverted flight.

Fractional notations next to roll symbols indicate roll portions greater or smaller than 1/2. As drawn, the figure depicts a quarter roll flown on a vertical up-line.

Inverted Spin

 Triangular symbol with small line indicate spins. Spins come in 3/4, 1, 1 1/4 and 1 1/2 turns. During spin entry, the plane has to show a stall break, followed by the auto-rotation. The rotation has to stop exactly after the specified number of turns. Once the rotation has stopped, a vertical downline has to be established.
Snap Roll Equilateral triangles indicate snap rolls.

Hammerhead

Hammerhead Turn 

It starts with a quarter loop into a vertical climb. When the plane stops climbing, it pivots around its vertical axis (which is now horizontal). The nose moves in a vertical circle from pointing up through the horizon to pointing down. After moving vertically down to pick up speed again, the maneuver is finished with the last quarter of a loop to horizontal flight. This figure can have optionally rolls on both the up-line and the down-line.

Humpty-Bump

 Humpty Bump

The figure starts with a quarter loop to a vertical climb. A small diameter half loop is performed near stall speed and results in a vertical down-line. The figure completes with another quarter loop to horizontal flight.