In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

The word chōng in pinyin refers to which Chinese character?, Context: Examples are 河 hé "river", 湖 hú "lake", 流 liú "stream", 沖 chōng "riptide" (or "flush"), 滑 huá "slippery". All these characters have on the left a radical of three short strokes (氵), which is a reduced form of the character 水 shuǐ meaning "water", indicating that the character has a semantic connection with water. The right-hand side in each case is a phonetic indicator. For example, in the case of 沖 chōng (Old Chinese *ɡ-ljuŋ), the phonetic indicator is 中 zhōng (Old Chinese *k-ljuŋ), which by itself means "middle". In this case it can be seen that the pronunciation of the character is slightly different from that of its phonetic indicator; the process of historical phonetic change means that the composition of such characters can sometimes seem arbitrary today.
沖