For example, if you were develop-ing a performance-based bid to the Air Force, you should read Air Force Instruction 63-124 (April 1, 1999), âPer-formance-Based Service Contracts.â These guides are widely available on federal Web sites.
The proofreader uses a series of symbols and abbreviations to suggest changes, correct spelling errors, improve punctuation, and generally enhance the quality and readability of a hard copy document. Locating proofreading marks. In hard copy proofreading, corrections typically appear in the left or right margins beside the line containing the error. A mark is also placed in the text to indicate where the correction needs to be made. A caret (^) indicates an addition, and a line through the text indicates a deletion or a replacement. Proofreading marks are traditionally written in red ink for better visibility. Frequently used proofreading marks. Delete: , , or
Save. QED stands for the Latin--quod erat demonstrandum--that is demonstrated.. QED is a traditional annotation to mark the end of an argument or mathematical proof. Both the meaning and the abbreviation have undergone some evolutions.1  What Does Et Al Mean in Real Estate?2  What Is the Meaning of Bhp?ED stands for the Latin--quod erat demonstrandum--that is demonstrated.. QED is a traditional annotation to mark the end of an argument or mathematical proof.