A stock symbol is a series of letters assigned to a security for trading purposes. Investors started using them to streamline hundreds of trades being made by the minute.

What Do The Abbreviations, Numbers, And Letters Mean On An Oil Container? In the past, the API service category was more complicated than it is today.

The Institute for Safe Medication Practices has published a free, downloadable two-page list of error-prone abbreviations, symbols and dose designations.