What is the nautical flag for the letter S?

Sierra
Letter flags (with ICS meaning)

Letter/ phonetic name Blazon Meaning when used with numeric complements
P Papa Azure, an inescutcheon argent
Q Quebec Or
R Romeo Gules, a cross or Distance (range) in nautical miles.
S Sierra Argent, an inescutcheon azure Speed (velocity) in knots

What is the proper size for a signal flag?

These flags are available in four sizes. Size 0 nautical flags are 12”x 18”, pennants are 8”x 24” and the substitute flags are sized 8” x 16”. Size 3 nautical flags are 24”x 24, pennants are 16” x 36” and substitute flags are 16” x 32”. Size 7 flags are 36”x 36”, pennants are 24”x 24” and substitutes are 24”x 48”.

What does the code flag mean?

: one of the flags patterned for maximum visibility that are used to exchange messages between ships at sea, the distinctive pattern of each flag symbolizing a particular letter, word, or phrase.

What was the signal flag used for?

Signal flags are used at sea for communication between ships. They can spell out short messages, and individual flags and combinations of flags also have special meanings. Signal flags are also used to ‘dress’ ships during celebrations, as seen below on Cutty Sark.

What is a Blue Peter flag?

The signal that a ship is about to sail and that all persons concerned should report on board. It is a rectangular flag with a blue ground and a white rectangle in the centre. It also represents the letter ‘P’ in the International Code of Signals.

What is the total number of signal flags?

The flags have independent meanings; however when used together they can spell out words and communicate complex messages. The flags include 26 flags which denote the letters of the alphabet, ten numeral pennants, one answering pennant, and three substituters or repeaters.

What is a set of signal flags called?

The Semaphore flag signaling system is an alphabet signalling system based on the waving of a pair of hand-held flags in a particular pattern.