It's a question of space. It takes up less space than annotating everything
A symbol is a picture on a map. It is usually small and if you look it up in the map key it tells you what that symbol on the map is, and a little description of one or two words saying what that symbol means or stands for.
thin black lines
A Star
A Star
A flag symbol on a map typically represents a location of interest or importance, such as a city, landmark, or resource. It is used to help the map reader easily identify key points on the map.
If log cabins are shown on a map, the symbol used will be found in the map's legend.
A house symbol is used to show a city on a map. It can be a single house or a cluster of houses.
iron
only to show qualitative aspects of reality
A star symbol found on a map, generally indicates the absolute location of a capital city. To find the absolute location of a place on a map, longitude and latitude are used.
most map I have seen had the book symbol
If you mean on a map it is a star. That is the traditional symbol on maps. Sacramento is our capital.