13.4b Slash (oblique stroke) with single letter abbreviations.

Where context makes the meaning clear, single letter abbreviations that are separated by a slash do not require a letter sign. These expressions should not be divided between braille lines. Examples:

c/o Sam Jones
b/w TV set

In situations where a single letter could be misread, as in (w/copy) where the w is an abbreviation for with, not will, use a letter sign for clarity. [Slashes between numbers will be studied in the next lesson. For diagonal slashes used in poetry see Lesson 18.]