Add Barré-Sign for Guitar
Above you can see a traditional Barré-Sign for guitar:
vertical line with one hook at the bottom.
Roman numbers at the top indicate fret.
Line is adjustable in hight.
I would suggest to add it to the "lines" palette as it represents a very common and widely used guitar sign. With a nice advantage: hook position indicates number of strings involved in Barré (we use partial and full barré-fingering).