Centring the Jack - Placing the Jack on the rink’s centre line when at rest, but retaining the same distance from the mat line.
Delivery - Releasing the Jack/bowl using an underarm movement.
Disturbing the head - Altering the position of the live Jack or any live bowls on the playing field.
End - Period of play completed when the jack and all bowls are delivered and points have been awarded.
End ditches - There are two ditches on the field, the ‘front ditch’ (at the end of the green directly in front of the mat) and the ‘rear ditch’ (at the end of the green directly behind the mat).
Holding surface - Natural or synthetic material used to stop anything running along the ditch.
Line Jack/Line bowl - A bowl/Jack which comes to rest inside and outside the side boundary of the rink.
Pace of the green - Time taken from delivery to rest from the mat line 27 metres away.
Boundaries - Refers to both the side boundaries and the end boundaries on the field of play.
Shot indicators - Otherwise known as lollipops or paddles, these are signs with coloured heads matching the colours found on the side of each player’s or team’s bowls. Number held up indicates how many shots are awarded and to whom after each end.
Bias - Curved path in delivery. The bias side is the more rounded side of the bowl, signified by a series of small grooved rings in the centre (there are large rings on the other).
Type - Set of bowls should all be or have the same make, model, size, weight, colour, bias, engraving and serial number.