* DAT: This stands for the Dental Admission Test. It's a standardized test required for admission to most dental schools in the United States and Canada.
* MCAT: This stands for the Medical College Admission Test. It's a standardized test required for admission to most medical schools in the United States, Canada, and other countries.
* PCAT: This stands for the Pharmacy College Admission Test. It's a standardized test used for admission to pharmacy schools in the United States and some other countries. However, its use is declining as many schools are moving to other admissions criteria.
If you encountered "DAT MCAT PCAT" somewhere, it's probably referring to one or more of these tests, possibly in a context where all three are relevant (e.g., discussing different healthcare professions). Without more context, it's impossible to say for certain what it means.