depends on what the map represents, Latitude and Longitude for one, Isobars for another, may be contours, could be isotherms, could be isohyet, could be isopectic, could be isogon.
The lines on a map that run north-south are called meridians of longitude, and the lines that run east-west are called parallels of latitude. These lines help to indicate the location and coordinates of different places on Earth.
longitude lines
Equator
A map with contour lines is called a topographic map. These lines represent changes in elevation and help to visualize the shape of the terrain. Topographic maps are commonly used for hiking, surveying, and land navigation.
Lines on a map connecting places with equal rainfall are called isohyets. These lines help depict variations in rainfall across different regions.
Lines that run up and down on a map are called "longitude lines" or "meridians." These lines help indicate the east-west position or direction of a location on the Earth's surface.
Contour lines.
The lines on a map that form a grid system are called latitude and longitude lines. Latitude lines run horizontally and measure distance north and south of the equator, while longitude lines run vertically and measure distance east and west of the Prime Meridian.
A map with contour lines is called a topographic map. These lines represent changes in elevation and help to visualize the shape of the terrain. Topographic maps are commonly used for hiking, surveying, and land navigation.
The horizontal lines are called latitudes and the vertical lines are called longitudes.
The are called Contour Lines.
Lines of Longitude or Meridians
The lines are parallel on the map are called Latitudes.
They are called the magnetic field lines.
They are called the magnetic field lines.
They are called the magnetic field lines.
Called both Elevation Lines or Contour Lines
The lines that are perpendicular to the latitude lines on a map are called longitudinal lines. There are 24 of them, each representing 15 degrees of change.
Coordinate Grids, I believe.
Isobars