black letter

(calligraphy) A highly calligraphic Western European script style used from approximately 1150.

(typography) A Northern European style of type, with contrasting thick-and-thin, angular strokes forming upright letterforms, and usually set with a dark typographic colour on the page.

Text set in black-letter type.

(law) The basic standard elements for a particular field of law, which are generally known and free from doubt or dispute.