Four Immeasurables
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tshad means measure, med is a negation, so tshad med means immeasurable. bzhi is four, so there we have the four immeasurables. Now, there are other translations of this term, the four unlimited states, and so on, but I like this term myself, as the idea is that by cultivating these four, the benefits are immeasurable.
Sangye Khadro has a beautiful commentary on the four immeasurables here.
Next we will first present the four immeasurables, and then go through a very common four-liner foun in many practice texts (in this case Sakya practice texts) where the four immeasuables are cultivated.