threepence
noun
three·pence ˈthre-pən(t)s 
ˈthri-,
ˈthrə-,
US also ˈthrē-pen(t)s
plural threepence or threepences
1
: the sum of three pennies
Note: Threepence is usually used of three British pennies.
2
: a coin worth three pennies
Word History
First Known Use
1589, in the meaning defined at sense 2