All defined terms are in italics and are listed alphabetically in the Definitions section - see pages 2235.
During a stipulated round, a player must not:
Except on the putting green, a player may have the line of play indicated to him by anyone, but no one may be positioned by the player for that purpose on or close to the line or an extension of the line beyond the hole while the stroke is being made. Any mark placed by the player or with his knowledge, for the purpose of indicating the line of play, must be removed before the stroke is made.
When the player's ball is on the putting green, the line of putt may be indicated before, but not during, the stroke by the player, his partner or either of their caddies; in doing so the putting green must not be touched. A mark must not be placed anywhere for the purpose of indicating a line of putt.
(Touching line of putt - see Rule16-1a)
Match play - Loss of hole; Stroke play - Two strokes.
Note: The Committee may, in the conditions of a team competition (Rule 33-1), permit each team to appoint one person who may give advice (including pointing out a line for putting) to members of that team. The Committee may establish conditions relating to the appointment and permitted conduct of that person, who must be identified to the Committee before giving advice.