Bad registry keys?

[kerr.jnr]

I've noticed some non-standard registry keys (one example below and image attached) that appear to be Avast-related and all contain the same structure and content.  I have Windows 10 x64.

I would like to know what process created them and whether they are safe to delete?

Regards
Andrew

------------------------------------------------------------

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\⁈ᱳਐᱳ■ 
Eꑸ᳼vast S+]
"cl"=dword:00000003

[HKEY_CURRENT_USER\⁈ᱳਐᱳ■ 
Eꑸ᳼vast S+\cache2]

[HKEY_CURRENT_USER\⁈ᱳਐᱳ■ 
Eꑸ᳼vast S+\ext]

[kerr.jnr]

Pretty disappointed this post hasn't been responded to, or even acknowledged