Mind Your En And Em Dashes: Typographic Etiquette. Advertisement An understanding of typographic etiquette separates the master designers from the novices.
A well-trained designer can tell within moments of viewing a design whether its creator knows how to work with typography. Style guide. A or an before H?
Use an before a silent H: an heir, an hour, an honest politician, an honorary consul; use a before an aspirated H: a hero, a hotel, a historian (but don't change a direct quote if the speaker says, for example, "an historic"). With abbreviations, be guided by pronunciation: eg an LSE student. Style Guide.