| distribution of luminous intensity having at least one axis of symmetry or at least one plane of symmetry Note 1 to entry: Sometimes the term "symmetrical luminous intensity distribution" is used in the sense of the term "rotationally symmetrical luminous intensity distribution". This usage is to be discouraged. Note 2 to entry: This entry was numbered 845-09-25 in IEC 60050-845:1987.
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