New rule for Little League in 2017.

["Lurker"77]

#3 is just pitch selection and location. That makes more sense than other signs, I guess. Otherwise, our new bunt sign is yelling "Bunt!" and if you react, you are ejected.

From Little League® Rule and Regulation Changes Announced for 2017 Season

Stealing and Relaying of Pitch Selection and Location

Starting in 2017, local league umpires will have the option to adopt the rule that the stealing and relaying of signs to alert the batter of pitch selection and/or location is unsportsmanlike behavior. If, in the judgment of the umpire, this behavior is occurring, both the player and the manager may be ejected from the game. The same rule will be mandated during tournament play.