Printing

• ascender

  (printing) the part of tall lowercase letters that extends above the other lowercase l...

• descender

  (printing) the part of lowercase letters that extends below the other lowercase lette...

• serif

  A short line at the end of the main strokes of a character.

Musical Notation

• bar line

  A vertical line before the accented beat marking the boundary between musical bars.

• staff line

  Any of the 5 horizontal marks comprising a staff.

• ledger line

  A short line; a notation for extending the range above or below the staff.

Also contains

• spectrum line

  An isolated component of a spectrum formed by radiation at a uniform frequency.

• isometric line

  A line connecting isometric points.

• hairline

  A very thin line.

• dotted line

  A line made up of dots or dashes; often used to indicate where you are supposed to sign...

• squiggle

  A short twisting line.

• trend line

  A line on a graph indicating a statistical trend.

• shaft

  A line that forms the length of an arrow pointer.

• cross hair

  Either of two fine mutually perpendicular lines that cross in the focus plane of an optical...

• graduation

  A line (as on a vessel or ruler) that marks a measurement; "the ruler had 16 graduations...

• guideline

  A light line that is used in lettering to help align the letters.