Ah, the classic sad onion.
I believe it is indicating that the child lock is only 85% effective.
How the hell they arrived at that number we may never know, but I’ll bet you it’s buried on page 4,987,253 in clause 6, subsection 8 of European Union Product Safety Report 156.421a. Or something.
May be something related to child resistant packaging. From the CPSC FAQ on the Poison Prevention Packaging ACT “For a package to be child-resistant, at least 85% of tested children must not be able to open the package during the first 5 minutes of the test”.https://www.cpsc.gov/FAQ/PPPA
Tintin in jail 85% of the time?