  Pictograms (also called symbols) are widely used in daily life as a type of
visual language, such as transportation venue signs (airport, rail station,
etc.), road signs, care symbols on clothing, or direction symbols (Tijus et
al., 2007). This shows how symbols can communicate information quickly and
effectively. Fundamentally, symbols can be understood, regardless of the
person's language or literacy skills. Therefore, people with communication
difficulties may benefit from using symbols to comprehend what other people are
saying, as well as to express themselves. There are many sets of pictograms
available online or in the market as printed cards, some of them are free and
some must be purchased. Pictogram sets can be considered in several ways
including how pictorial, how guessable, how flexible, how consistent, and how
visually complex. Each symbol set has strengths and weaknesses, and the choice
of a symbol set should be based on the needs and abilities of the person using
AAC.
