The term DAT can refer to three different things. WHO is an acronym for the World Health Organization, which is a specialized agency of the United Nations that is responsible for international public health. TRU is an acronym for the Transportation Research Unit, which is a research unit within the Department of Civil Engineering at the University of Canterbury in New Zealand. TRUE is an acronym for Test of Reading and Understanding in English, which is a standardized test used to measure the reading and understanding skills of non-native English speakers.