He was supposed to come on Wednesday just like you told me but there was no sign of him.

no 是否定词，表示"没有"。 sign 是名词，意思是"迹象、征兆"。 of 是介词，表示所属关系或关联。 no sign of 是一个固定搭配，表示"没有...的迹象"，用来描述某事物或某人没有出现或没有发生的状态。