What is not considered a default “medium” in Google Analytics?

[akshaypandit]

What is not considered a default “medium” in Google Analytics?

[imriakapoor]

The first default medium is “organic.” It represents traffic that comes from organic, or unpaid.

Another default medium is “referral.” Any traffic that comes to your site from another website that's not a search engine will show up in your reports as a “referral.”

The final default medium is “(none).”

[John-Smith]

Google Analytics detects three mediums without any customization.

The first default medium is “organic.” It represents traffic that comes from organic, or unpaid, search
results.

Another default medium is “referral.” Any traffic that comes to your site from another website that’s
not a search engine will show up in your reports as a “referral.”

The final default medium is “(none).” This medium is applied only for users that come directly to
your site by either typing your URL into a browser or clicking on a bookmark. In your reports, you
will see these users have a source of “direct” and a medium of “(none).”