| Geometry | point |
| Geometry Description | Sigma (uppercase Greek letter), horizontally symmetrical |
| Verified? | yes |
| Verification Method | systematic study involving people with visual impairments |
| Verified by (count) | 15 |
| Verified Technique(s) | Swell paper, UV printing, 3D printing |
| Recommended Technique(s) | UV printing, 3D printing |
| Planar Size (mm) | Not applicable |
| Symbol Height (mm) | 2 |
| Line Element Width (mm) | 6 |
| Colour (HEX) | #000000 |
| Input Source Type | journal article |
| DOI | https://doi.org/10.1080/15230406.2024.2379456 |
| Meaning / Map use | Old element |
