The wearing of black clothing is often a 'symbol of' mourning in Western cultures.
The company's 'symbol' [='logo'] is a red umbrella.
“K” is the 'symbol for' a strikeout in baseball.
(..) Down there, please. Thank you. From the dynasty of Akbar the Magnificent, and for over a thousand years our nation's religious symbol, the Pink Panther. Largest and most famous diamond in the world. Irreplaceable. Its value cannot be estimated in terms of money. (..)1975 The Return of the Pink Panther