ANSWER: with respect to Toyota Landcruisers, It is a model designator. For example FJ40, FJ45, etc. The The "F" indicates the engine family: F,2F,3FE. The "J" indicates that it was made in Japan. Newer model Landcruisers continue to use that model. For example 3VZJ, etc. Toyota Tacomas also use similar model and production location indicators.
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