Measure (typography)
Encyclopedia
Measure in typography refers to the width of a block or column
Column (typography)
In typography, a column is one or more vertical blocks of content positioned on a page, separated by gutters and/or rules. Columns are most commonly used to break up large bodies of text that cannot fit in a single block of text on a page. Additionally, columns are used to improve page composition...

 of text from the left margin
Margin (typography)
In typography, a margin is the space that surrounds the content of a page. The margin helps to define where a line of text begins and ends. When a page is justified the text is spread out to be flush with the left and right margins...

 to the right margin. Punctuation
Punctuation
Punctuation marks are symbols that indicate the structure and organization of written language, as well as intonation and pauses to be observed when reading aloud.In written English, punctuation is vital to disambiguate the meaning of sentences...

 should preferably hang
Hanging punctuation
Hanging punctuation or exdentation is a way of typesetting punctuation marks and bullet points, most commonly quotation marks and hyphens, so that they do not disrupt the ‘flow’ of a body of text or ‘break’ the margin of alignment. It is so called because the punctuation appears to ‘hang’ in the...

 outside the measure. It is relative to each design
Design
Design as a noun informally refers to a plan or convention for the construction of an object or a system while “to design” refers to making this plan...

, but can be used as a unit of measurement within that design to create unity and harmony.

The measure of a text influences legibility. Long lines are hard to read, short lines are more easily read. 45–75 characters per line are regarded as the ideal range for the measure. For multiple column setups, 40–50 characters are often preferred. 66 is sometimes considered ideal for one column setups. Generally, if the measure is wide, the leading
Leading
In typography, leading refers to the distance between the baselines of successive lines of type. The term originated in the days of hand-typesetting, when thin strips of lead were inserted into the formes to increase the vertical distance between lines of type...

of a text should be increased—if the measure is short, it is can safely be decreased. Reverse text, i.e. white text on black also requires more leading.

The measure or the length of a legible line is the length of the alphabet (Caps, Lowercase and Numerals) of a typeface of a size being used.
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