.H

.H n [heading] [suffix]

Print a numbered heading at level n, where n is from 1 to 7. The optional suffix is appended to the heading, and may be used for footnote marks or other text that should not appear in the Table of Contents. See any of the following sections 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.