EPIC
From ACT Wiki
A short code used to identify listed securities in the UK.
For example, G4S PLC has the EPIC 'GFS'.
The term 'EPIC' itself originated from the London Stock Exchange's former 'Exchange Price Input Computer'.
The formal term for the codes subsequently became TIDM (Tradable Instrument Display Mnemonics), but the term EPIC is still widely used.
(Tradable is an alternative spelling of 'tradeable'.)