Android – meaning of / symbols in UML

I tried to follow this link http://www.uml-diagrams.org/android-camera-uml-class-diagram-example.html In the camerademo class, we find "/" after each access specifier. For methods such as onstart(), onstop(), # (for example: # / onstart()) what does the "/" there mean

Thank you in advance

resolvent:

/The in attribute is used to indicate derived, but it does not exist in the operation

I can't find any explanation for symbols in the specification, so we can only treat them as part of the name

The specification (UML v2.5) states:

So there is no sign of derivation or/