They are called lines
The lines for depression are called hachured lines
The lines are called perpendicular lines.
Lines that cross each other are called intersecting lines.
On the globe they are called lines of LATITUDE and are parallel to the equator.
Those raised lines are called "frets".
if you're talking about the part with the lines across it (frets) its called the neck
A hollow guitar is called an Acoustic guitar.
the lines are meant to show symbols
they are lines
I believe his guitar is called a Burtit.
the guitar is called "guitar"!
bass guitar
acoustic guitar
They are called strings. Really! <a href="http://www.buildmyelectricguitar.com/electric-guitar/">My Electric Guitar build</a>
The lines that extend the staff are called ledger lines.
The first elecric guitar was called the Frying Pan. :)