The symbol × is sometimes used in titles like 「ラビ×ラビ -パズルアウトストーリーズ-」 or headlines like this one: 「スシロー×寿司ストライカー スペシャルキャンペーン」.
I imagine native speakers who read it might pronounce it as と, since it seems to mean "and", like in the above example of a game with two characters and a joint campaign.
How is the symbol actually pronounced?
This type of × (indicates a close relationship between two things/people) is usually simply ignored, just as we do not bother to read ❤ or ★ aloud in titles and such. "ラビ×ラビ" is read as ラビラビ as if it were one word. "スシロー×寿司ストライカー" would be pronounced with a small pause between スシロー and 寿司ストライカー.
Similar examples from real manga titles:
- HUNTER × HUNTER （pronounced as ハンターハンター）
- サーバント × サービス （pronounced as サーバントサービス）
- ノゾ × キミ （pronounced as ノゾキミ）
When you must read this symbol aloud (e.g., when you need to tell the "spelling" of this title over the phone), you can read it as かける or バツ.
× resembles English slash in that they can signify a close (romantic) relationship between two people (often of the same sex) :)
Another possibility, depending on the context/title, is "cross" (「クロス」).
These all happen to be video games, so I don't know if this reading carries over to other things/areas/media.
