ECG interpretation isn't something you can learn by trying to memorize what a particular rhythm looks like. You need to learn the criteria for each individual rhythm, and then apply those criteria, using a consistent, systematic approach, to each strip you are evaluating.
When I analyze an ECG rhythm strip I use the following mnemonic: RRPPQQS.
ate: What is the rate? Less than 60 or greater than 100? If an ectopic pacemaker site, is the rate less than or greater than the intrinsic rate for the pacemaker.
egularity: Is the rhythm regular? If irregular, Is there a pattern to the irregularity?
wave: Are P waves present? Is each P wave followed by a QRS complex?
R interval: 0.12 - 0.2 seconds.
RS complex: 0.06 - 0.1 seconds, although you will find some variation to these values.
T/QTc interval: Some centers will have you measure, and correct for rate, the QT interval.
For the rhythm you posted. Forget for the moment that the P and T waves appear peaked. Does this ECG tracing match the criteria for any rhythm?
If you aren't familiar with ECG interpretation, you might find the Life in the Fastlane ECG Library