Analyze the given sequence.
The sequence consists of three symbols (a triangle, square, and circle) with letters \( S \), \( C \), and \( O \) arranged in groups of three.
The sequence is:
\[
\triangle S \, \square O, \, C \, O \, S, \, \square C \, S, \, C \, S \, \square.
\]
Observing the pattern, it seems that the geometric shapes and letters are alternating in a consistent cycle. The shape after each letter set shifts positions but follows a pattern of \( \triangle, \, \square, \, C, \, O \), and the corresponding letters follow similarly in a cyclic manner.
The next element in the sequence will be \( \triangle \, S \, \square \), as it continues the observed order.