Performance Gap. Background. In recent years, the housebuilding industry and government have grown increasingly concerned over the potential gap between design and as-built energy performance.
The apostrophe (â or ') is a punctuation mark, and sometimes a diacritical mark, in languages that use the Latin alphabet or certain other alphabets.In English, it serves three purposes: 1  The marking of the omission of one or more letters (as in the contraction of do not to don't).he apostrophe (â or ') is a punctuation mark, and sometimes a diacritical mark, in languages that use the Latin alphabet or certain other alphabets. In English, it serves three purposes: 1  The marking of the omission of one or more letters (as in the contraction of do not to don't).
2. apostrophe-the mark (') used to indicate the omission of one or more letters from a printed word. punctuation mark, punctuation-the marks used to clarify meaning by indicating separation of words into sentences and clauses and phrases. Translations. [ÉËpÉstrÉfÉª] N.. the punctuation mark ' used to indicate the omission of a letter or number, such as he's for he has or he is, also used in English to form the possessive, as in John's father and twenty pounds' worth. [C17: from Late Latin, from Greek apostrophos mark of elision, from apostrephein to turn away].