Answer:
Conventional Signs. The common symbols including letters that are used for representing various relief and cultural features are called conventional signs.
Kinds of Conventional Signs. These are two types :
(i) Natural signs
(ii) Cultural signs.
(i) Natural signs : These signs are used for depicting the physical features of the earth's surface such as relief, vegetation and drainage etc.
(ii) Cultural signs : These signs are meant for showing man-made things on the map, such as railways, roads and human settlement etc.