Learner's definition of SYMBOL
an action, object, event, etc., that expresses or represents a particular idea or quality
— often + of
see also sex symbol, status symbol
The wearing of black clothing is often a symbol of mourning in Western cultures.
The lion is a symbol of courage.
The flag is a symbol of our country.
a letter, group of letters, character, or picture that is used instead of a word or group of words
— usually + for
“K” is the symbol for a strikeout in baseball.
“Cl” is the chemical symbol for chlorine.
“+” is the symbol for addition.