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While, ideally, a diagram is enlarged or broken up so that labeling is clear, sometimes it is appropriate to provide a key or legend. A key is especially helpful in reducing the clutter and confusion of a large number of labels or long label names.
When a key is used, it must be explained in a transcriber's note beginning in cell 7 with runovers in cell 5. The closing transcriber's note symbol follows the last item of the key list.
If possible, when there are both an author's key and a transcriber's key, they should both be placed on the same page as the tactile graphic to which they refer. The author's key should be first, followed by the transcriber's key. A blank line should be left above and below each key group.
All labeling must be horizontal and placed no closer than 1/8 in. to the related element.
The keyed items should begin in cell 1 with runovers in cell 3. If the list of keyed items is long or more space is needed, it is permissible to place them in two columns with two blank spaces between the columns.
A key may consist of textured items, numbers and/or two-letter non-short-form word combinations.
- It is best to choose two-letter abreviations which are suggestive of the item represented
- In a two-letter combination, at least one of the two letters should contain a dot 3 or a dot 6.
- Care must be taken with textured items to ensure that they are exact representations of the textures in the tactile diagram.
- The items in a numeric key are listed consecutively beginning with number one written unpunctuated in literary braille.
- Two-letter keyed items are generally listed in the order in which they are encountered in the print text. If the list is rather long they may be listed alphabetically.
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