I think the notemaker meant here and in the similar notes* the numbers of the power towers, as it is suggested in the wiki to tag with ref=XX
https://wiki.openstreetmap.org/wiki/DE:Tag:power=tower?uselang=de#Beispiel

*) 
https://www.openstreetmap.org/note/3724558#map=15/48.6597/17.0538&layers=N
https://www.openstreetmap.org/note/3724555#map=15/48.6297/17.0361&layers=N
https://www.openstreetmap.org/note/3724553#map=15/48.6008/17.0248&layers=N
https://www.openstreetmap.org/note/3724550#map=15/48.5684/17.0289&layers=N
https://www.openstreetmap.org/note/3724541#map=15/48.5419/17.0172&layers=N
https://www.openstreetmap.org/note/3724540#map=15/48.5161/17.0115&layers=N
https://www.openstreetmap.org/note/3724538#map=15/48.4838/17.0135&layers=N
https://www.openstreetmap.org/note/3724536#map=15/48.4596/16.9872&layers=N
https://www.openstreetmap.org/note/3724534#map=15/48.4380/16.9582&layers=N
https://www.openstreetmap.org/note/3724533#map=15/48.4079/16.9537&layers=N
https://www.openstreetmap.org/note/3724532#map=15/48.3792/16.9428&layers=N
https://www.openstreetmap.org/note/3724531#map=15/48.3524/16.9428&layers=N
https://www.openstreetmap.org/note/3724529#map=15/48.3492/16.9863&layers=N
https://www.openstreetmap.org/note/3724359#map=15/48.3067/17.0283&layers=N
https://www.openstreetmap.org/note/3724360#map=15/48.3081/17.0254&layers=N
https://www.openstreetmap.org/note/3724527#map=15/48.3215/17.0019&layers=N
