Does YouTube still have channel types?

I have about 3 or 4 channels and a couple of them that don't have profile pics I notice have different icons.

The channels I have, one is the initial channel a person gets when they first sign up with Google, they give you a YouTube Channel. A second I got I think a few or so years ago when YouTube made some changes they offered people the chance to change their channel name, that created a second account under the same email.

A third one is recent, I created it last year or 2013, to use for my freelance business and just a day or so ago a family member wanted me as a manager of one of his YouTube pages. So I have a few different YouTube channels under my Gmail Account.

But all that said, I notice that two of my accounts that don't have profile pics set have different default profile icons. One is a silhouette of a person the other is a silhouette of a square looking shape.

The person looking one is on my first initial account and I guess that's a personal account. So my question is what type of account or channel is the other with the square silhouette ?

Most the info on this that i find online and even YouTube seems to be outdated. Does YouTube still have account/channel types or no?