Main Page | See live article | Alphabetical index Th or TH may stand for: the symbol for the chemical element thorium (Th) the 29th letter of the Albanian alphabet, see th (letter) the symbol of thoracic vertebrae (Th1-Th12) a digraph used in English to identify the sounds /θ/ and /ð/ (IPA). in some Celtic languages to refer to the product of lenition of t. Thailand (ISO country code) This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.