What does ERK stand for?

Eric Franklin Boat, Sixes, OR - Manufacturer code for watercraft hull identification number (USCG)

Ethniko Rizospastiko Komma - National Radical Party - Greek (PPE)

Experimental Research Kit

Extracellular-Signal-Regulated Kinase - An enzyme

South Efate - Language code (ETLW)

enroute kit (SAUS)