busines business bussines communicate communication e-mail email Envelope enveloppe letter mail message note office post communicating display displayed ground helicopter helipad landing landing-pad landing-spot mark marked transport visual ballpoint black close up copyspace ink isolated macro nib pen point tip write writing cell dish electronics hills metal microwave mobile phone radiation radio shortwave television tower transmit transmitter air-conditioners air-conditioning building cambodia clouds colorful coloring colors colourful colouring colours communications communications-equipment concave connecting culture electrical-signals electromagnetic equipment feedhorn height high highrise light mauve modern multi-storey multi-story parabolic parabolic-reflector purple radio-waves receivers receiving roof rooftop round satellite-dishes Signals technical technology activity authorities authority behave behavior behaviour police reported reporting restricted restrictions sign suspicion suspicious warning above color colored colour coloured directing direction stairs steps sun-deck swimming-pool UP booth box britain british cambridge classic England english London old public red telephone uk airport airport terminal careless confusing conveniences directional sign faith inappropriate informative informing inter-faith interior miscommunication mixed communication mixed signals personal personal air personal light prayer prayer room signs toilet toilets travel travellers travelling unfortunate