The document summarizes the main types of Chinese characters based on their formation: 1) Pictograms are characters formed from drawings of objects like the sun, moon, trees. Approximately 600 characters are pictograms. 2) Ideograms represent abstract concepts using simple indicators added to pictograms. 3) Ideogrammic compounds combine two or more characters to suggest a third meaning, like combining wood and wood to mean forest. 4) The majority of characters, around 90%, are pictophonetic compounds with a semantic radical and phonetic component that together indicate meaning and pronunciation.