TI is Technical Infrastructure, organization responsible for management/storage/database/analytics/scheduling, etc. software in datacenters. TI and Cloud used to be different branches in the same PA (product area), but TI consumed Cloud Org once cloud became a priority and now it's a single organization (itself a part of PA which also includes G Suite).

Since external-facing cloud projects have very simple and transparent metrics (unlike internal TI projects), Cloud/TI organization mostly concentrates on cloud projects nowadays.