Tsp is the abbreviation for teaspoon and tbsp is the abbreviation for tablespoon.
Sometimes capital T is used for Tablespoon and lower case t is used for teaspoon.
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The abbreviations for tablespoons are T, Tbsp, or Tbs. The abbreviations for teaspoons are tsp or t. A tablespoon is larger than a teaspoon. In fact, 3 teaspoons equal one tablespoon.