What is the full form of SEI?

Could you please elaborate on the acronym "SEI" and provide its full form? I'm quite curious to know what it stands for in the context you're referring to. Is it related to a specific field or industry? Could you also explain its significance or any applications it might have? I'm quite fascinated by abbreviations and their meanings, so your clarification would be greatly appreciated. Thank you in advance for shedding some light on this acronym.