Can a Symbol be re-used on the Rarible platform?

What about on Opensea?

What are the character limits for Symbols?

AND is this symbol the same thing as creating a new crypto-currency or is it only to be used for a single collectible?

For example, lets say I have a portfolio of 10 different art pieces in my Sunset Collection.

Sunset-1

Sunset-2

Sunset-3

These would each be 10 different NFTs but part of my same art collection.

If I choose to use my own Rarible Collection rather than RARI, would I need to create 10 different Rarible Collection? Or could I create a collection called "Sunset" and somehow use it for each of my NFTs?