Half Ball
A contact where the line of aim goes through the centre of the cue-ball to the outside edge of the object-ball.
See:-  Ball Contacts

Half-Butt
A long cue, midway in length between an ordinary cue and the long-butt. It is used for playing shots that cannot be reached with the ordinary cue and rest.
See:-  Jigger · Long-Butt · Rests · Spider

Hazards

Losing Hazard Winning Hazard

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Describes the cue-ball being potted. Refers to an object-ball being potted.

See:-  Losing Hazard

Indirect Cannon - English Billiards
Describes a cannon played so the cue-ball strikes one or more cushions before contacting the second object-ball.
See:-  Cannon/s · Direct Cannons

In-Hand
When 'In-Hand' the cue-ball must be played from within the baulk semi-circle (or 'D').

English Billiards Snooker

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The striker must cause the cue-ball to contact a ball or cushion out of the baulk area before it strikes a ball within the baulk area. The striker may play directly at any ball that is 'on', whether in or out of the baulk area.

See:-  Baulk · 'D' · Double-Baulk

In-Off
Common name for a Losing Hazard
See:-  Losing Hazard

Jaw
Refers to the part of the cushion that curves in to form the pocket opening.
See:-  Cushion/s · Pocket/s · Undercut

Jenny - Long & Short - English Billiards
See:-  Long Jenny · Short Jenny

Jigger
An old term for the rest, now hardly used but can still be found in some dictionaries.
See:-  Half-Butt · Long-Butt · Rests · Spider

Jump Shot
Illegal in both English Billiards and Snooker, even if the cue-ball only jumps over the outside edge of the object-ball.

Kick
An unnatural contact between the cue-ball and object-ball. Commonly believed to be caused by a speck of dust or chalk on either ball at the point of contact.

Kiss
A contact between any two balls.
See:-  Double Kiss

Leave
Describes the position of the balls after the striker has played.

Large Ball - English Billiards
When an object-ball close to a cushion gives the player a wider margin of error when playing for a cannon on that ball. With the three balls in the position shown, even if the cue-ball strikes the cushion somewhere near the black cross the cannon will still be made.
See:-  Cannon/s · Big Pocket

Left-Hand Spot of the 'D'
The spot on the left-hand edge of the 'D'.

Uses:-

English Billiards - Snooker -

None  For spotting the Green ball.

See:-  Baulk Spots · Spots

Line Ball - English Billiards
An object-ball that lies exactly on the baulk-line. Such a ball is considered to be in 'Baulk' and cannot be played at directly when the striker is 'In-Hand'.
See:-  Baulk · Baulk-Line · 'D' · Double-Baulk · In-Hand

Lip
If a ball is so close to the edge of the pocket that it could not be moved any closer without falling in, it is said to be on the 'lip' of the pocket.
See:-  Fall · Pocket/s

Long-Butt
An extra-long cue used when the cue-ball is at the opposite end of the table from the striker, and beyond the reach of the ordinary cue or half-butt.
See:-  Half-Butt · Jigger · Rests · Spider

Long-Jenny - English Billiards
Any in-off similar to that shown in the diagram. In the example given the shot would be played with strong left-hand side to spin the cue-ball into the pocket from the jaw of the cushion. The stroke would be more difficult if the red were on the other side of the centre pocket.
See:-  Losing Hazard · Pocket Side
            Short Jenny

Loser
Common name for a Losing Hazard

Losing Hazard
Describes the cue-ball being potted after contact with another ball.