This is the acronym for the Online Gaming Regulatory Authority. The ARJEL was an independent online gaming regulatory authority created in 2010. Its aim was to open up the online gambling sector to competition. It is the law on the liberalization and regulation of online gambling of May 12, 2010 that created the ARJEL. The ARJEL gave (it does not exist anymore, see paragraph below) approvals to gambling rooms so that they could operate legally in France. You could see an ARJEL logo on the poker rooms approved by the ARJEL.
Modification of the ARJEL
On May 22, 2019, the ARJEL became the National Gaming Authority by the law on the growth and transformation of companies. According to the official definition, "The National Gaming Authority ensures compliance with the objectives of the gaming policy for games and bets under exclusive rights, online games and bets subject to approval and for games in casinos and gambling clubs". A French player who plays at a poker room that is not approved by the National Gaming Authority would have no recourse in the event of a dispute with the gaming room.