Style of preferred spelling, punctuation, spacing, hyphenation and indentation used by a designer, printer, publishing house or by a particular publication to ensure consistent typesetting. 
The characteristic style or manner of visual presentation of a company or organisation, especially as applied to its publications and printed matter
A publication's guide to style, spelling and use of grammar, designed to help journalists write and present in a consistent way for their target audience. The Economist publishes a style guide as does The Guardian.
An organisation’s set of rules for how language and other elements are used, usually contained in a style guide available to all editorial staff. Style guides can vary from basic rules on spelling and grammar to complex documents on how words are used and pronounced.
A specific publisher’s preferred style.