This document discusses independent Chinese characters called "indicative characters" or "simple ideograms" that express abstract meanings through simple symbols. These characters either add indicators to pictographs to create new meanings or directly illustrate abstract concepts. The document provides examples of characters that use indicators like short strings or lines to represent concepts such as root, treetop, up, down, middle, big, small, and others. It notes that indicative characters are fewer in number than pictograms.