Question

What is the negative space enclosed by letterforms called

Answer 1

Negative space enclosed by letterforms is called counters.
Negative space is white space that letters such as O or D have (enclosed white space within the letter). Well, in typography, that white/negative space is called a counter, or aperture, or inner space, or enclosed space.

Answer 2

Answer:

Negative space encased by letter forms is called counters.  

Explanation:

Negative space is void area that letters, for example, O or D have (encased blank area inside the letter). All things considered, in typography, that white/negative space is known as a counter, or opening, or inward space, or encased space.A letter form is a kind of glyph, or, in other words, solid method for composing a dynamic character or grapheme. The state of a letter of a letter set particularly from the viewpoint of plan or improvement.