Social Selling Index (SSI)
The Social Selling Index (SSI) is a measure on LinkedIn tracking how effectively a user builds their personal brand, connects with prospects, engages with insights, and strengthens relationships on LinkedIn. High SSI scores indicate strong social selling potential.
Shield is not tracking your SSI, because let's be honest, what matters is not that metric per se, but the benefits you unlock by being active on the LinkedIn platform. As such, Shield is tracking your organic content performance as well as profile activity for you to learn what works and what doesn't. (Ultimately leading to a higher SSI score too.)