What does the inner triangle in the symbol of under-five clinic denote?

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E6 Comprehensive Textbook of Community Health Nursing for BSc Nursing Students Part 2 — Subpart A (pp 1-275 of 550) p. 242-244
E6 Text Book Of Pediatric Nursing 3rd Panchali Pal — Part 1 (pp 36-238 of 713) p. 46-48
Practise the full AIIMS Raipur NO - 2019 (Shift-1)
Attempt every question from this paper in a timed mock, then review the full solution for each one.