a dot or other small mark in writing or printing, used as a diacritic, punctuation, etc.

a very small part or quantity; a particle, jot, or whit

He said he didn't care a tittle.

noun

crumb , dab , dash , dot , dram , drop , fragment , grain , iota , jot , minim , mite , modicum , molecule , ort , ounce , particle , scrap , scruple , shred , smidgen , speck , trifle , whit