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In page Show jumping:

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At international level competitions governed by FEI rules, fence heights begin at 1.50 metres (4 ft 11 in). In the United States, jumping levels range from 0–9, for example USEF jumper level 0 has fences 2'6" to 2'9" high and up to 2'9" to 3'0" wide, and level 9 has fences 4'9" to 5'0" high and up to 5'0" to 5'6" wide. In Germany, competition levels are denoted by the letters E, A, L, M, S, and correspond to heights ranging from 0.80 to 1.55 meters.[citation needed]