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(groff)Sizes

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Sizes
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   `gtroff' uses two dimensions with each line of text, type size and
vertical spacing.  The "type size" is approximately the height of the
tallest character.(1) (Note: Sizes-Footnote-1)  "Vertical spacing" is
the amount of space `gtroff' allows for a line of text; normally, this
is about 20% larger than the current type size.  Ratios smaller than
this can result in hard-to-read text; larger than this, it spreads the
text out more vertically (useful for term papers).  By default,
`gtroff' uses 10 point type on 12 point spacing.

   The difference between type size and vertical spacing is known, by
typesetters, as "leading".

Changing Type Sizes

Fractional Type Sizes