"soprano voice"
"soprano sax"
"the boy still had a fine treble voice"
"the treble clef"

"a claim for treble (or triple) damages"
"a threefold increase"

"a ternary operation"
"a treble row of red beads"
"overcrowding made triple sessions necessary"
"triple time has three beats per measure"
"triplex windows"

"a double (or dual) role for an actor"
"the office of a clergyman is twofold; public preaching and private influence"
"every episode has its double and treble meaning"

"Triple your income!"