Naming convention list when objects ends with "s"

Question

A normal list can be called like this (this is what I learned at school):

List<Object> objects = new List<Object>();

But, how does a list has to be called when the object itselfs ends with a "s".

List<Octopus> octopuss = new List<Octopus>();
List<Boss> bosss = new List<Boss>(); 

It seems wierd to add another s. Not many (single) words end with "s". So, this is one of the first time I encountered it. Did anyone found a source where this is explained?

EDIT

These words have a plural noun. But what about these:

List<Series> series? = new List<Series>();
List<Species> species? = new List<Species>();

Answer 1

Basic Plurals

For variables that contain multiple items, it's best to use basic english plurals:

• object -> objects

• disk -> disks

With words ending with 's':

• boss -> bosses

• octopus -> octopi OR octopuses

With zero plural nouns (words that are the same in singular and plural):

This is where it gets more difficult. You could choose to adopt a separate name for plural and singular like:

• sheep -> flock

You could simply add an 's' or 'es' anyway (not proper english, but may be more clear in code):

• series -> serieses

• species -> specieses

• sheep -> sheeps

You could choose to adopt a standard, like adding Coll or similar to the end of the name:

• series -> seriesColl

• species -> speciesList

• sheep -> sheepSet

Refer: https://www.grammarly.com/blog/plural-nouns/