using tone indicators are a good idea but shortening them is not, imo
the point is to add context and if you already need some starting context to begin with, that's p much useless to me
due to the abbreviation you lose portability because if the person you're talking to is used to a different set of abbreviations or googles it and finds a different list than you've been using you get the exact thing you're trying to prevent: miscommunications about tone in text exchanges
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