OHP
From Longman Dictionary of Contemporary EnglishOHPOHP /ˌəʊ eɪtʃ ˈpiː $ ˌoʊ-/ noun [countable] British English the abbreviation of overhead projectorExamples from the CorpusOHP• First and foremost is that almost every facility has an OHP projector whereas not all have slide projectors.• If you intend using an OHP make sure that the screen can be clearly seen by all.• Tendency to read out OHP captions.• At the same time another technology emerged which, for small groups at least, added a new dimension to the OHP.From Longman Business DictionaryOHPOHP abbreviation for OVERHEAD PROJECTOR