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
Check. 1  The symbol Ë over a letter is commonly pronounced  check  by mathematicians. 2  The typographical name for the symbol is caron or haÄek. 3  The haÄek is used in Äech cohomology and occasionally in other fields. 4  In LaTeX, $\check{x}$ is coded as \check{x} in math mode. In many branches of math, the bar may be used to denote the closure (however it is defined) of a substructure of a mathematical structure. 2  The bar is also used to denote the conjugate of a complex number. 3  The typographical name of the symbol is macron.