While the term "splitter" is apt enough, a better choice might be "mirror" or "duplicator." Essentially, an HDMI splitter mirrors input from a source device -- such as a media str ...

You may need to search for a splitter with 4K 120Hz support, or else step your gaming down to 1080p. Likewise, if one of your outputs is an 8K TV, you'll probably want an 8K-ready splitter.