For a pressure pulse (or blast wave), the pressure developed above atmospheric pressure is called the overpressure
Health and Safety Executive (HSE), Glossary of Terms Used In The Case Relating To The Explosion At Buncefield Oil Storage Depot, HSE, Merseyside, England, UK 2014. http: //www.hse.gov.uk/news/buncefield/glossary.htm, (Hlth and Sfty - Brit) {700}