A Guitar Amp which only consists of the Preamplifier and Power Amplifier stages. Speakers are purchased in a separate unit called a Speaker Cabinet. Amp Heads, or "Heads" are usually less expensive than an equivalent Combo Amp, as they do not have speakers, but they are far more durable and flexible.
Check out this awesome Dual Rectifier Amp Head I got!
Maker of cheap guitar gear that focuses mainly on modeling. Notorious for their cheapness and crappy sound, they somehow manage to have caught on with such acts as Metallica and Black Sabbath. Why anyone would actually buy this shit, that's beyond me. So don't ask me why. The only thing i could think up would be the stupid wannabe metalhead teenagers who want to saturate a perfectly good guitar tone with nauseating digital reverb.
Hey dude, i just got a Line 6 Spider Half-Stack and burned it for shits and giggles!