Is PEN the same as sol?

Could you please clarify the difference between PEN and SOL? I've heard the two terms used interchangeably in some crypto discussions, but I'm not entirely sure if they refer to the same thing. Could you elaborate on their respective meanings and uses within the cryptocurrency and finance realm? Is PEN a specific type of token or coin, and if so, how does it differ from SOL? Also, if they're not the same, could you explain why they might be confused for each other? Thank you for your assistance in clarifying this matter.