This requirement is waived in all contexts where such marks are not normally included: email, on-line discussion, non-graphical advertisements (when permitted), and academic papers. We encourage the use of the symbol whenever possible, but recognize that many non-commercial and informal uses will omit it. | This requirement is waived in all contexts where such marks are not normally included: email, on-line discussion, non-graphical advertisements (when permitted), and academic papers. We encourage the use of the symbol whenever possible, but recognize that many non-commercial and informal uses will omit it. |