First, I should check if X-X-X is a placeholder or represents a specific term. Sometimes, people use Xs to obfuscate letters. Let's consider if "X-X-X" could be a substitution. If each X is a missing letter, like in a puzzle, maybe it's "AAA" or "ABC"? Wait, maybe it's a cipher where X corresponds to another letter. If X is in the alphabet, maybe it's shifted by a certain number. X is the 24th letter. If I shift backward, maybe it's "V-V-V", but that's not helpful. Alternatively, maybe "XXX" is a Roman numeral for 30, but how does that relate to 2.5 meters?