Scarlet in a sentence as a noun

Things like yellow stars, scarlet letters, that kind of thing.

"The existence of privilege is not a scarlet letter on young white dudes who code.

The occasional job change shouldn't merit a scarlet letter.

Scarlet in a sentence as an adjective

Having cheating on your college transcript is a scarlet letter if you're thinking about graduate school.

[Edited to add] I would sure love to see a scarlet letter list of companies which allow such practices, so I can never use them.

He could have taken the degree without attending it but decided to be there in person for the sake of his proud parents, especially this father, who had given him the money that enabled him to begin his Cambridge studies....Wearing evening dress with a white bow tie, a small black cap and black silk down with a scarlet-lined hood, he knelt on a velvet cushion, placed his hands together and held them out to be grasped by the Vice Chancellor, who delivered a prayer-like oration.

Scarlet definitions

noun

a variable color that is vivid red but sometimes with an orange tinge

See also: vermilion

adjective

of a color at the end of the color spectrum (next to orange); resembling the color of blood or cherries or tomatoes or rubies