October 15, 2020 at 7:53 pm #36213
Thank you for the question. Please accept our million apologies that we missed it at first.
Yes, using the transcriber-defined shapes ⠈⠫⠗⠉ and ⠈⠫⠃⠉ for the red chips and black chips pictured in print seems reader-friendly and practical, because we can use a transcriber-defined shape in both UEB and Nemeth Code contexts, according to #5 under Basic Guidance on When to Switch in the Guidance for Transcription Using the Nemeth Code within UEB Contexts (Approved April 2018).
For the table example you so beautifully shared, there is one question: Might it not be more clear to use a listed table format and repeat the column headings, especially where there are multiple things to be filled in within a single row?
Regardless, it is alright to use in the table a UEB shape for the gray squares that indicate blanks to be filled and to use in the math expressions that follow the table a Nemeth shape for the gray squares that indicate blanks to be filled. This is because there is no meaning to the squares other than "something needs to go here." In other words, the student is not expected to take answers from the table and use them to complete the items after the table, so the gray squares do not need to have the same braille representation in both places.