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I'm not aware of any standard convention for Transform Frame names. The frame names are simple strings, with no concept of hierarchy. You can use "/" character if you like, but it will have no special meaning. It is best to avoid using a "/" as the first character, as internally the ros code strips it off for historical reasons.

Use whatever convention you think looks best.

I'm not aware of any standard convention for Transform Frame names. The frame names are simple strings, with no concept of hierarchy. You can use "/" character if you like, but it will have no special meaning. It is best to avoid using a "/" as the first character, as internally the ros code strips it off for historical reasons.

Use whatever convention you think looks best.

Note: that there is a parameter named tf_prefix, but it is deprecated. Do not assume this feature works at all.