What are these funny letters at the right bottom?

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12.6.1 What are these funny letters at the right bottom?

You will find two small windows titled `Position' and `Match ID' at the bottom of the GNU Backgammon window. Here you may use the `position_id'- or `match_id'-format for setting up or copying positions.

An explanation of both formats is found in the GNU Backgammon's documentation.