SYSTEM OF SIGNS Method of communication of messages through written characters or through signals previously established between the parties . The letters, the gerbils, the icons, the ideograms are signs of writing, the code of the deaf-mute are living signs. The Braille sign system is tactile, for blind people.
ECONOMIC SUSTENTO (and not economic sustenment) It is the action and effect of financially supporting a person, company or institution, sustaining it. It's not about the other meaning of sustenment that means food, food. Some synonyms, words or similar expressions may be financial support, financial support