Mystery line/rope found in locker

Arno Luijten

Dear Forum,
In one of our cockpit lockers of our A54 I found this line/rope. I knew it was in there but I still fail to come up with a sensible usage of this thing. It seems the previous owner used it frequently but for what I have no clue.
Anyone want to take a guess?

Arno Luijten,
SV Luna,

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