any vessel less than 65.6 feet in length
some means to make an efficient sound signal some means to make an efficient sound signal
The referee blew his whistle to signal that there was a penalty.
The referee's whistle.
3 long blast to the ship whistle.
Because the men liked the signal.
This is taken from the International and Inland Rules book, provided by the USCG.* Note* So there is a difference in the whistle signal of two short blast by definition between International rules and Inland Rules.InternationalSound and light signalsRule 34Maneuvering and Warning signals.(a) When two vessels are in sight of one another, a power driven vessel when underway, when maneuvering as a authorized or required by these rules, shall indicate that maneuver by the following signals on her whistle.-Two short blast to mean " I am altering my course to port";InlandSound and light signalsRule 34Maneuvering and Warning signals(a) When power driven vessels are in sight of one another and meeting or crossing within half a mile of each other, each vessel underway, when maneuvering as a authorized or required by these rules:(i)Hall indicate that maneuver by the following signals on her whistle: two short blasts to mean "I intend to leave you on my starboard side"There needs to be an agreement between the vessels in inland waters.The vessel will sound the same signal in agreement.
mostly to get kids attention or to signal for help
You have to whisper in the library so you won't disturb people who are reading.
the referee will blow his whistle and stop the play
The signal for a fire on boards is a long blast on the ship's whistle along with sounding of the vessel's general alarm.
whistle In swimming, the race actually begins with a beep from a starting system after the command take your mark.The referee turns control over to the starter with a long whistle. But the whistle does not start the race normally.When the electronic starting system malfunctions, a blank gun or whistle can be used to signal the start of the race.
A whistle can symbolize urgency, warning, or attention. In literature, it may represent a call to action, a signal of danger, or a means of communication. Whistles can evoke themes of alertness, readiness, or the need to pay attention.