Option 1: T-55 is a battle tank. The T-55 is a Soviet-designed main battle tank that was widely used by many countries during the Cold War era.

Option 2: T-155 does not signify a battle tank. This option is correct. There is no known tank designated as T-155. Tanks are typically designated with numbers, not a combination of numbers and letters.

Option 3: T-72 is a battle tank. The T-72 is a Soviet-designed main battle tank that was used by many countries during the Cold War and is still in service in some countries today.

Option 4: T-90 is a battle tank. The T-90 is a Russian main battle tank that is an advanced version of the T-72.

In conclusion, option 2 is the correct answer as T-155 does not signify a battle tank. Alert - The question should have had the correct answer as option 2.