A tetromino's orientation, with regards to Tetris refers to the different ways that tetromino can exist after rotations.
Normally all the tetrominoes have a total of nineteen orientations, but probably to make things more symmetric, newer games add six orientations: two for S, Z, and I.
Orientations can be described either by the way they point (especially for T, which at least one reviewer has compared to a finger gesture[1]) or by the way the longest flat side faces.
Point up
Flat down
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Point right
Flat left
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Point down
Flat up
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Point left
Flat right
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