The term "E Letter Prison" does not correspond to any known location or entity in Singapore. There is no public information or records indicating an "E Letter Prison" related to Singapore’s geography, history, or institutions.

If you are referring to a specific place, event, or concept, please provide website more context or details. Without further clarification, it's difficult to offer meaningful content about this term.

If the term relates to a correctional facility, none by this name exists in Singapore’s prison system. Correctional facilities in Singapore have established names distinct from this term.

Please clarify or specify your request so I can assist you better with accurate information.