The American Printer: A Manual of Typography / Containing practical directions for managing all departments of a printing office, as well as complete instructions for apprentices; with several useful tables, numerous schemes for imposing forms in every variety, hints to authors, etc.

by Thomas MacKellar

Sp. gr.—Specific gravity.

S. P. Q. R.—Senatus Populusque Romani, the Senate and people of Rome.

S. P. R. S.—Sublime Prince of the Royal Secret.

Sq. ft.—Square foot or square feet.

Sq. in.—Square inch or inches.

Sq. m.—Square mile or miles.

Sq. r.—Square rood or roods.

Sq. yd.—Square yard.

Sr.—Sir; Senior.

S. R. I.—Sacrum Romanum Imperium, Holy Roman Empire.