Would the items found in the games (Rings, shields, etc) count as power-ups for Sonic and co.?

[EzSonic01]

As we know, most platform games, such as the Mario ones, have power-ups for the player character to use. Since the beginning of the series, we've seen several ítems that could be used by Sonic and his friends to their advantage. From several variations of rings and shields, to speed shoes, invincibility, the Emeralds, etcetera, all of them can benefit the heroes in some form.  These are found in most games of the franchise, whether be enclosed in monitors as in the classic timeline, or capsules in the modern era. The gems almost always are located in Special Stages.

  

So, well, the question is on the title. Could these ítems qualify as power-ups?

[Diogenes]

...yes. That is what they are.

[Badnik Mechanic]

Yeah that's what a power up is.

It power ups your character in some way.