Answer: Tactile characters are designed to be read by touch, and should not have abrasive or sharp edges. They are used to help the impaired and disabled with laws such as ADA (American with Disabilities Act)
What is different between visual characters and tactile characters?
Answer: Visual readers need different strokes with characters, such as upper, lower, large, and even bold. Tactile readers benefit with characters that are smaller and have thin beveled edges to be read by touching.
For ADA signage, using a combination of visual, tactile, and braille lettering is the widespread policy of most government, scholar, and corporate signs. This may require you making
You can ready more from the United States Access Board regarding the ADA Law on tactile signage – https://www.access-board.gov/guidelines-and-standards/buildings-and-sites/about-the-ada-standards/ada-standards/chapter-7-communication-elements-and-features