i think the I's are for measures the /'s for beats and/or strums and they are chords.
My Gear
Agile AL-3000 Prestige Slim Profile Neck
Schecter C-1 PLUS
Washburn WD18SW Solid-Wood Acoustic
Vox AD30vt with the VFS2 footswitch
Fender PT-100 tuner
Vox wah pedal
oh..those are LS...i thought they were I'S...or maybe...i dont know...but the chords are right?