What does a '1' mean in the middle of a staff?

In this example I found the numeral ‘1’ in the middle of the staff. What does that mean in sheet music ?

Is it something that would effect playback in Dorico or is it just for information only ?
I managed to get the difficult stuff from that bar into Dorico (cross staff notes and slur) like this:

except for that ‘1’. Should that be just a text object in engrave mode ?
Thanks for tips :slight_smile:

It is possibly a fingering.
The fingering popover is invoked with shift-F.

1 Like