"Unique" means "one of a kind."
"Unique" is one of the most abused words in the English language.
It's very common to read and hear the phrase "most unique." It's used in speeches, ads, commercials, websites, books and news reports. The phrase is used by idiots -- and by smart people who should know better.
Since "unique" means "one of a kind," all unique things are equally unique. Nothing can be the most unique. Nothing can be more unique than another.
A unique snowflake is just as unique as a unique person or pencil.
It's OK to say "most unusual" or "more unusual," but NEVER modify "unique."
snowflake photo from CalTech. Fingerprint image from Galaxys5Us.com Thanks.