This is the 296th most frequent Danish word.
nummer
"Nummer" in Danish means "number" in English.
Here, 'nummer' refers to a ticket or token identifier used to reclaim items in the cloakroom.
Jeg har glemt mit nummer til garderoben.
I have forgotten my ticket number for the cloakroom.
In this context, 'nummer' represents a phone number to be dialed for assistance.
Hvilket nummer skal vi ringe til for at få hjælp?
Which number should we call to get help?
The context here uses 'nummer' colloquially to mean a song or musical track.