The doctor diagnosed an SI dysfunction that was causing her lower back pain.

SI announced a major grant to support research into ocean biodiversity.

During the review, the SI report highlighted severe signal reflections on the high-speed lines.

Si announced a new environmental policy at the conference.

On the shelf, the manuscript was cataloged as Si to indicate its source.

The research team measured the defect density in a-Si thin films after prolonged illumination.

In solfège class, she practiced the si until she could sing the leading tone perfectly.

Si tossed the old coin into the fountain, making a wish for the coming year.

Si was a notable prefecture in imperial China, renowned for its administrative and cultural influence in the region.

At the pep rally, the cheer squad led the crowd in a loud sis boom bah to get everyone excited.