Naked Triple
Intermediate Removes candidates Used in: Sudoku, Killer Sudoku, Calcudoku, Futoshiki
Three cells in a unit between them hold only three candidate digits (each cell shows two or three of them). Those three digits are reserved for those three cells, so they can be removed from every other cell in the unit.
How to spot it
Three cells in a unit whose candidates are drawn from the same three digits (two or three each).
What you can conclude
Remove those three digits from the rest of the unit.
Worked example
Three cells reading {1,4}, {4,8} and {1,8} lock up 1, 4 and 8; a fourth cell reading {1,4,6} loses 1 and 4, leaving 6.