Diploma
A diploma was a document signifying one's graduation from an educational program.

In 2374, within the Vic's lounge holoprogram, after hearing that Odo, thanks to Vic Fontaine's tutelage, was the head of his class (i.e. very talented at singing), Melissa continued the metaphor by offering to help him get his diploma. ()

During a conversation with Lisa Cusak over subspace communication, Miles O'Brien commented on the common assumption that one could only receive counseling from someone who had a diploma in that field, rather than, as Cusak suggested, one's friends. ()

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Education