SIGNAL
a gesture, action, or sound that is used to convey information or instructions, typically by prearrangement between the parties concerned
an electrical impulse or radio wave transmitted or received
an apparatus on a railway, typically a coloured light or a semaphore, giving indications to train drivers of whether or not the line is clear
convey information or instructions by means of a gesture, action, or sound
striking in extent, seriousness, or importance; outstanding
an electrical impulse or radio wave transmitted or received
an apparatus on a railway, typically a coloured light or a semaphore, giving indications to train drivers of whether or not the line is clear
convey information or instructions by means of a gesture, action, or sound
striking in extent, seriousness, or importance; outstanding