The letter combination "CH" can have multiple meanings depending on its context. It could refer to: 1) The sixth letter of the alphabet, 2) A sound used in some languages like German or Scottish Gaelic, 3) Chemistry (as in chemical), 4) Switzerland (in geographical terms as CH stands for Confoederatio Helvetica - the Latin name for Switzerland), 5) Chord (a musical term), 6) Charley (as a nickname), among other possibilities.