Flag

A piece of cloth, often decorated with an emblem, used as a visual signal or symbol.

A flag flown by a ship to show the presence on board of the admiral; the admiral himself, or his flagship.

A signal flag.

The use of a flag, especially to indicate the start of a race or other event.

A variable or memory location that stores a true-or-false, yes-or-no value, typically either recording the fact that a certain event has occurred or requesting that a certain optional action take place.

In a command line interface, a notation requesting optional behavior or otherwise modifying the action of the command being invoked.

An abbreviation for capture the flag.

Any of various plants with sword-shaped leaves, especially irises; specifically, Iris pseudacorus.

A slice of turf; a sod.

A slab of stone; a flagstone, a flat piece of stone used for paving.

To mark with a flag, especially to indicate the importance of something.

something

To signal to, especially to stop a passing vehicle etc.

To note, mark or point out for attention.

To signal (an event).

To set a program variable to true.

To weaken, become feeble.

To lay down flagstones.