Is E width standard?

Excuse me, could you please clarify what you mean by "E width standard"? Are you referring to a specific standard in the world of cryptocurrency or finance, perhaps related to the dimensions of some sort of token or hardware wallet? Or is this a question related to the sizing of a different product entirely? I'm just a bit confused, as "E width" isn't a commonly used term in our industry. Could you please provide some more context or specify exactly what you're asking about?