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The & character is used to reference and assign coordinate variables. In order to assign a coordinate variable to a dimension, the dimension must be named.
Coordinate Variables
Are single-dimension arrays that have the same size as the dimension they are assigned to. A coordinate array represents the data coordinates for each index in the named dimension. These arrays contain monotonically increasing or decreasing values.The & character is used to reference and assign coordinate variables. In order to assign a coordinate variable to a dimension, the dimension must be named.
T!0 = "lat" ; name the dimension T&lat = lat ; assign the coordinate variableConsiderably more information about named dimensions and coordinate variables may be found in the "Variables" section of the NCL Reference Manual