The octothorpe The octothorpe is composed of simple Octothorpe geometric shapes and four primary colors. The symbol is legible at most sizes, and a small version is provided for micro applications. The two basic shapes used in the octothorpe—a speech bubble and a lozenge—can be extracted and used as graphic elements. 19x19 Grid 18 Slack Brand Guidelines Design Elements
Slack Brand Book Page 16 Page 18