When writing my songs in my notebook, where the chorus or bridge is identical in different places, I'll just write Repeat Chorus or Bridge to save space. When I go to record my vocal on the song, I'll write it all out in full. I don't have one of those bars to hang lyric sheets from, but I do lay them out in front of me on the desk. I found if I leave the lyrics in shorthand (i.e., Repeat, etc.), the switching of my attention back and forth leads to me losing my place. The only place I keep the abbreviated version is at instrument breaks/solos - then I write it as [Instrument] Break Verse x 4 Chorus x 1, etc.