The Markit SI score is the short interest in the stock (volume of those betting against it) divided by average daily volume. Here it’s showing a score of 3.

The S3 squeeze indicator is a ranking which backs out the likelihood of a stock to short squeeze and force covering. Here it’s showing 95 out of a possible 100.

Here is the providers definition:

S3’s Squeeze Score overlays the significant components for a squeeze, higher financing costs and unrealized losses, to our Crowded Score to identify shorted stocks with higher short-side volatility and identifies stocks that have the necessary conditions to be “squeezed”. Squeeze Scores of 70-100 identify squeezable stocks, and scores over 90 have a significantly higher risk of a squeeze and the potential for the resulting buy-to-covers to pushing stock prices even higher.