Each Datastream series is assigned a unique code, DS mnemonic or DS code depending on financial category.
For equities, DS Mnemonic is usually made of a equity ticker preceded by a suffix determining the Exchange, e.g. U:F, @FB. DS code for equities is a six-digit number. Dead equity series retain only DS code.
The Oxford University Libraries have created several helpful guides for finding specific information on Datastream. They are linked below.
Using Datastream is easier from within the Excel plug-in, which is installed on our terminal. The video below, created by McGill University Library, demonstrates how to find time series information using Excel.