.H

.H n [heading]

Print a numbered heading at level n, where n is from 1 to 7. See any of the following for more information:

Number registers

Ej

Page eject.

Hb

Break after heading.

Hc

Centered heading.

Hi

Type of first paragraph after heading.

Hs

Space after heading.

Hu

Unnumbered headings.

Strings

HF

Font control.

HP

Point size.

Macros

.HM

Heading mark.

.HU

Unnumbered headings.

.HX, .HY, .HZ

User-supplied macros invoked during output of header.