noun

• (pathology) Initialism of systemic lupus erythematosus. [(pathology) A systemic autoimmune disease (or autoimmune connective tissue disease), where the immune system attacks the body's cells and tissue and causes inflammation and tissue damage.]
• (planetology, areology) Initialism of single-layer ejecta.
• (Singapore, in road signs) Abbreviation of Seletar Expressway.