The lines connecting points of equal temperature on a weather map are called isotherm lines.
The two parts of the word isotherm are isomeaning "same" and therm meaning "temperature".
A similar construction is used for isobar, meaning a line of equal pressure.
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The lines on a map for pressure stands for Isobars which they are lines on a map around areas with the same pressure readings to indicate highs and lows.
what is line connecting places of equal salinity
isobars
Contour lines show areas of equal height.
Contour line connect points of equal elevation on a map, whereas relief is the difference in elevation from the highest and lowest on a map.