An oblique (/) is also called a diagonal, slash, slant, virgule, or solidus. It is not usually immediately preceded or followed by a space. It is commonly used in place of a dash or hyphen, or to separate words or numbers.
Use an oblique between units of measure or sides of a ratio.
2003/2004 fiscal year
price/earnings ratio of 17.5
Use an oblique in place of or and and/or when expressing alternatives.