Systerms : system terms : Probability grade

A (41) | B (23) | C (62) | D (45) | E (33) | F (34) | G (18) | H (16) | I (28) | J (2) | K (5) | L (14) | M (29) | N (17) | O (10) | P (62) | Q (10) | R (41) | S (74) | T (31) | U (12) | V (12) | W (8) | X (1) | Y (2) | Z (2)

"Probability levels" usually refer to the qualitative or quantitative grading of how likely an event is to happen in risk assessment, reliability engineering, or safety analysis (commonly from levels 1–5 or A–E), but the exact divisions vary by industry/standard, and there's no unified global standard.

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