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90° — the right angle
90 degrees is the right angle, the foundation of geometry and architecture. It divides the full angle into four equal parts of a circle. Without right angles, rectangular buildings, coordinate systems, and most technical drawings are impossible.
Science
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The 90s — era of change
The 1990s were an era of the USSR's collapse, the rise of the internet, and the grunge and pop music boom. Several key peace agreements were signed worldwide. The generation that grew up in the 90s is called 'millennials'.
Dates
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90 — a triangular number
The number 90 is a notable integer that reduces to 9 in numerology (9+0=9) — the number of completion, wisdom, and humanitarianism. It represents the culmination of a cycle in many spiritual traditions.
Numerology