What are Series D, E, F, and G in Startup Investments?

In the investment details of startups, there are Series A, B, and C. What are D, E, F, and G?

Hello?

I don't quite understand, so I'm asking you.

These days, when I read articles about venture capital investments,

Seed

Pre-Series

There are Series A, B, and C, which I roughly understand,,

Series D, E, F, and G also appear.

How should I understand each stage, or how should I define them?

Thank you in advance.

https://m.blog.naver.com/s-valueup