From: Asmus Freytag (
Date: Wed May 17 2000 - 23:11:22 EDT

At 06:22 AM 5/16/00 -0800, Doug Ewell wrote:
> >> The summum is reached by TM.
> >
> > It was part of a pre-existing encoding (ISO 8859-1). And it is not a
> > symbol created by an individual company.
>U+2122 TRADE MARK SIGN is not encoded in ISO 8859-1, nor any other part
>of ISO 8859-1. It is widely encoded in vendor character sets, though.
>Windows character sets place it at 0x99.

The Windows character set (as far as column 0x8x and 0x9x) was in turn
based on sets found in many printers. The collection of printer characters
in this range was most likely influenced by the Mac character set and
corresponding popular postscript fonts. (While the current MacRoman mapping
supported by W2K shows a TM, it also shows a Euro sign, so I can't be 100%
sure the TM has been there from the beginning).

In the US, there are other symbols that would be needed, e.g. SM for
'service mark'. It seems that the user community is happy with using markup
or rich text for the contexts where that is required - nobody has
complained about an 'omission' in Unicode.


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