1. Early PL/I.
2. Experimental Programming Language.
3. Eden Programming Language.
4. Equational Programming Language. Szymanski, RPI. Equational language for parallel scientific applications. "EPL - Parallel Programming with Recurrent Equations", B. Szymanski in Parallel Functional Languages and Compilers, B. Szymanski et al, A-W 1991.
Other products, such as Perlier's body cream and shower gel, were licensed, under the epl banner.
Eat, Pray, Love, or epl, as it is known by acolytes, is a 334-page memoir that was published in 2006.