Guidelines

Begin with a back-slash { \ }
End with forward-slash { / }
These can be dashed – with two breaks in between:
High Contrast — Bi-colour
preferably Black & White.
Enclose in a rectangle
with 'Dash–Dot' border style
Title Case
e.g. 'Apple' 'Mango'
OCR friendly Font like OCR-A, OCR-B & OCR-A Extended (free)
with fixed width (mono-spaced) glyphs

Begin with a back-slash { \ }
End with forward-slash { / }
These should be dashed – with two breaks inbetween:
Use vector images
like SVG
Should not be colour relient
monochrome logographs should be easily distinguishable
Minimalistic graphic design.