glossy glass flag of ics alpha

abstract alpha alphabet banner blinker blue boat code codes color communicate communication dictatorship element emblem evolution flag flaghoist francoist glass glossy ics illustration important international lamp language letter marine maritime matters message messages most nautical naval navigation navy number ocean pattern pavillon radiotelegraphy radiotelephony recent regarding related safety sail sailboat sea semaphore ship sign signal signalling signals sos symbol system systems use vessels water wave waving white yacht