"Man overboard." (often attached to the man overboard pole on boats). With a sinister hoist, the semaphore flag.
The Blue Peter. In harbor: All persons should report on board as the vessel is about to proceed to sea. At sea: It may be used by fishing vessels to mean: "My nets have come fast upon an obstructio…
"My vessel is 'healthy' and I request free pratique."
"The way is off my ship." With one or more numerals, distance (range) in nautical miles.
"Keep clear of me; I am engaged in pair trawling." With four numerals, local time. (The first two denote hours and the rest minutes.)
"You are running into danger."
"I require assistance." With one or more numerals, speed in kilometres per hour.
"I require medical assistance."
"Stop carrying out your intentions and watch for my signals."
"I am dragging my anchor."
The symbol for a battery in a circuit diagram. It originated as a schematic drawing of the earliest type of battery, a voltaic pile.
In electronics, a diode is a two-terminal electronic component with an asymmetric transfer characteristic, with low (ideally zero) resistance to current flow in one direction, and high (ideally infin…
A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element.
Alchemical symbol for earth
Alchemical symbol for water.
Alchemical sign for air.
Alchemical symbol for fire.
Alchemical symbol for Arsenic.
|The Sulfur Symbol|
Alchemical symbol for sulfur.
Alchemical sign for stone.
The five-pointed red star is a symbol of communism as well as broader socialism in general. It is sometimes understood to represent the five fingers of the worker's hand, which run the five continent…
|Divided Highway Ahead|
Alternate U.S. divided highway ahead sign.
|Divided Highway Ends|
Ireland divided highway ends sign
According to the Abjad system of Isopsephy, the word Bahá' has a numerical equivalence of 9, and thus there is frequent use of the number 9 in Bahá'í symbols. The most commonly used symbol connected…
The Red Cross on white background was the original protection symbol declared at the 1864 Geneva Convention.