The spiral is actually on the bottom left of the symbol.
Check out Unilever's rationale behind their "U" logo design:
"Our logo was designed to include 25 icons, each of which represents something important to Unilever. From a lock of hair symbolising our shampoo brands to a spoon, an ice cream, a jar, a tea leaf, a hand and much more, the little icons all have a meaning."
https://www.unilever.com/about/who-we-are/our-logo/
The "little icons all have a meaning" fails to explain exactly which brand the spiral symbol relates to. The link to their "brand center" is behind a password wall. I'll try digging further and report my findings.
OK, doing a slightly deeper search on the brand logos that Unilever have incorporated into the "U" symbol doesn't reveal much about the individual components.
However, looking at this chart:
Shows the extent of their reach - note that this does not mean they "own" any of the related companies, but collude with them. Probably benign corporate relationships, and the spiral logo in the U may well be unrelated.
Until proven otherwise, we will need to be cautious to not go on a witchhunt unless more evidence is uncovered.
Edit - here's what's visible with a quick search of the brands that they own:
https://qph.ec.quoracdn.net/main-qimg-4f6101110cd9dacc490b6b78df823b03-c?convert_to_webp=true